diff --git a/lib/model/frames.js b/lib/model/frames.js
index cc3b05779..45fd4fc46 100644
--- a/lib/model/frames.js
+++ b/lib/model/frames.js
@@ -116,7 +116,7 @@ Form.Attachment = class extends Frame.define(
     const data = {
       name: this.name,
       type: this.type,
-      md5: this.md5,
+      hash: this.blobHash,
       exists: (this.blobId != null || this.datasetId != null),
       blobExists: this.blobId != null,
       datasetExists: this.datasetId != null
diff --git a/lib/model/query/form-attachments.js b/lib/model/query/form-attachments.js
index ccb0bf03d..4e4ec82e9 100644
--- a/lib/model/query/form-attachments.js
+++ b/lib/model/query/form-attachments.js
@@ -133,12 +133,12 @@ update.audit = (form, fa, blobId, datasetId = null) => (log) => log('form.attach
 // This unjoiner pulls md5 from blob table (if it exists) and adds it to attachment frame
 const _unjoinMd5 = unjoiner(Form.Attachment, Frame.define(into('openRosa'), 'md5'));
 
-// This function returns the blob md5 if it exists, otherwise it returns null.
-// This is used for listing the form attachments within Central and unlike `_chooseHash`
-// below, doesn't need to look at the dataset timestamp to compute a synthetic hash.
-const _chooseSimpleHash = (attachment) => {
-  if (attachment.blobId) return attachment.with({ md5: attachment.aux.openRosa.md5 });
-  return attachment.with({ md5: null });
+// This function returns the blob's md5 hash if it exists, otherwise it returns null.
+// This is used for listing the form attachments within Central and unlike `_chooseDynamicHash`
+// below, doesn't need to look at the dataset timestamp to compute a dynamic hash.
+const _chooseBlobHash = (attachment) => {
+  if (attachment.blobId) return attachment.with({ blobHash: attachment.aux.openRosa.md5 });
+  return attachment.with({ blobHash: null });
 };
 
 const getAllByFormDefId = (formDefId) => ({ all }) =>
@@ -146,20 +146,21 @@ const getAllByFormDefId = (formDefId) => ({ all }) =>
   left outer join (select id, md5 from blobs) as blobs on form_attachments."blobId"=blobs.id
   where "formDefId"=${formDefId} order by name asc`)
     .then(map(_unjoinMd5))
-    .then(map(_chooseSimpleHash));
+    .then(map(_chooseBlobHash));
 
 const getByFormDefIdAndName = (formDefId, name) => ({ maybeOne }) => maybeOne(sql`
 select ${_unjoinMd5.fields} from form_attachments
 left outer join (select id, md5 from blobs) as blobs on form_attachments."blobId"=blobs.id
 where "formDefId"=${formDefId} and "name"=${name}`)
   .then(map(_unjoinMd5))
-  .then(map(_chooseSimpleHash));
+  .then(map(_chooseBlobHash));
 
-// This function decides on the openrosa hash (functionally equivalent to an http Etag)
+// This function decides on the OpenRosa hash (functionally equivalent to an http Etag)
 // It uses the blob md5 directly if it exists.
 // If the attachment is actually an entity list, it looks up the last modified time
 // in the database, which is computed from the latest dataset/entity audit timestamp.
-const _chooseHash = (attachment) => async ({ Datasets }) => {
+// It is dynamic because it can change when a dataset's data is updated.
+const _chooseDynamicHash = (attachment) => async ({ Datasets }) => {
   const { md5 } = attachment.aux.openRosa;
   if (attachment.blobId) return attachment.with({ openRosaHash: md5, md5 });
 
@@ -176,7 +177,7 @@ select ${_unjoinMd5.fields} from form_attachments
   left outer join (select id, md5 from blobs) as blobs on form_attachments."blobId"=blobs.id
   where "formDefId"=${formDefId}`)
   .then(map(_unjoinMd5))
-  .then((attachments) => Promise.all(attachments.map(FormAttachments._chooseHash)));
+  .then((attachments) => Promise.all(attachments.map(FormAttachments._chooseDynamicHash)));
 
 
 module.exports = {
@@ -184,6 +185,6 @@ module.exports = {
   update,
   getAllByFormDefId, getByFormDefIdAndName,
   getAllByFormDefIdForOpenRosa,
-  _chooseHash
+  _chooseDynamicHash
 };
 
diff --git a/test/integration/api/forms/draft.js b/test/integration/api/forms/draft.js
index e718a8690..48f6bc726 100644
--- a/test/integration/api/forms/draft.js
+++ b/test/integration/api/forms/draft.js
@@ -538,8 +538,8 @@ describe('api: /projects/:id/forms (drafts)', () => {
               .expect(200)
               .then(({ body }) => {
                 body.should.eql([
-                  { name: 'goodone.csv', type: 'file', exists: false, blobExists: false, datasetExists: false, md5: null },
-                  { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                  { name: 'goodone.csv', type: 'file', exists: false, blobExists: false, datasetExists: false, hash: null },
+                  { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                 ]);
               })))));
 
@@ -572,8 +572,8 @@ describe('api: /projects/:id/forms (drafts)', () => {
                 // eslint-disable-next-line no-param-reassign
                 delete body[0].updatedAt;
                 body.should.eql([
-                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2af2751b79eccfaa8f452331e76e679e' },
-                  { name: 'greattwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2af2751b79eccfaa8f452331e76e679e' },
+                  { name: 'greattwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                 ]);
               })))));
 
@@ -604,8 +604,8 @@ describe('api: /projects/:id/forms (drafts)', () => {
                 // eslint-disable-next-line no-param-reassign
                 delete body[0].updatedAt;
                 body.should.eql([
-                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2af2751b79eccfaa8f452331e76e679e' },
-                  { name: 'greattwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2af2751b79eccfaa8f452331e76e679e' },
+                  { name: 'greattwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                 ]);
               })))));
 
@@ -1139,8 +1139,8 @@ describe('api: /projects/:id/forms (drafts)', () => {
                 // eslint-disable-next-line no-param-reassign
                 delete body[0].updatedAt;
                 body.should.eql([
-                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2af2751b79eccfaa8f452331e76e679e' },
-                  { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                  { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2af2751b79eccfaa8f452331e76e679e' },
+                  { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                 ]);
               })))));
 
diff --git a/test/integration/api/forms/forms.js b/test/integration/api/forms/forms.js
index 7bac45d8d..635eb3e76 100644
--- a/test/integration/api/forms/forms.js
+++ b/test/integration/api/forms/forms.js
@@ -1226,8 +1226,8 @@ describe('api: /projects/:id/forms (create, read, update)', () => {
                 .expect(200)
                 .then(({ body }) => {
                   body.should.eql([
-                    { name: 'goodone.csv', type: 'file', exists: false, blobExists: false, datasetExists: false, md5: null },
-                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                    { name: 'goodone.csv', type: 'file', exists: false, blobExists: false, datasetExists: false, hash: null },
+                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                   ]);
                 })))));
 
@@ -1252,8 +1252,8 @@ describe('api: /projects/:id/forms (create, read, update)', () => {
                   delete body[0].updatedAt;
 
                   body.should.eql([
-                    { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2241de57bbec8144c8ad387e69b3a3ba' },
-                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                    { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2241de57bbec8144c8ad387e69b3a3ba' },
+                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                   ]);
                 })))));
 
diff --git a/test/integration/api/forms/versions.js b/test/integration/api/forms/versions.js
index e4fc02b6b..3304638bd 100644
--- a/test/integration/api/forms/versions.js
+++ b/test/integration/api/forms/versions.js
@@ -354,8 +354,8 @@ describe('api: /projects/:id/forms (versions)', () => {
                   delete body[0].updatedAt;
 
                   body.should.eql([
-                    { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2af2751b79eccfaa8f452331e76e679e' },
-                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+                    { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2af2751b79eccfaa8f452331e76e679e' },
+                    { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
                   ]);
                 })))));
 
diff --git a/test/integration/other/form-entities-version.js b/test/integration/other/form-entities-version.js
index f21059794..8e07eaf98 100644
--- a/test/integration/other/form-entities-version.js
+++ b/test/integration/other/form-entities-version.js
@@ -284,8 +284,8 @@ describe('Update / migrate entities-version within form', () => {
           // eslint-disable-next-line no-param-reassign
           delete body[0].updatedAt;
           body.should.eql([
-            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2241de57bbec8144c8ad387e69b3a3ba' },
-            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2241de57bbec8144c8ad387e69b3a3ba' },
+            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
           ]);
         });
 
@@ -318,8 +318,8 @@ describe('Update / migrate entities-version within form', () => {
           // eslint-disable-next-line no-param-reassign
           delete body[0].updatedAt;
           body.should.eql([
-            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2241de57bbec8144c8ad387e69b3a3ba' },
-            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2241de57bbec8144c8ad387e69b3a3ba' },
+            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
           ]);
         });
 
@@ -329,8 +329,8 @@ describe('Update / migrate entities-version within form', () => {
           // eslint-disable-next-line no-param-reassign
           delete body[0].updatedAt;
           body.should.eql([
-            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, md5: '2241de57bbec8144c8ad387e69b3a3ba' },
-            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, md5: null }
+            { name: 'goodone.csv', type: 'file', exists: true, blobExists: true, datasetExists: false, hash: '2241de57bbec8144c8ad387e69b3a3ba' },
+            { name: 'goodtwo.mp3', type: 'audio', exists: false, blobExists: false, datasetExists: false, hash: null }
           ]);
         });
     }));