diff --git a/chrome/content/zotero/zoteroPane.js b/chrome/content/zotero/zoteroPane.js
index 6b34a5ded..48d0a26f4 100644
--- a/chrome/content/zotero/zoteroPane.js
+++ b/chrome/content/zotero/zoteroPane.js
@@ -4123,8 +4123,7 @@ var ZoteroPane = new function()
 			}
 			else {
 				if (!item.isImportedAttachment()
-						|| (!Zotero.Sync.Storage.Local.getEnabledForLibrary(item.libraryID)
-							|| !Zotero.Sync.Storage.Local.downloadAsNeeded(item.libraryID))) {
+						|| !Zotero.Sync.Storage.Local.getEnabledForLibrary(item.libraryID)) {
 					this.showAttachmentNotFoundDialog(itemID, noLocateOnMissing);
 					return;
 				}
diff --git a/test/tests/zoteroPaneTest.js b/test/tests/zoteroPaneTest.js
index 073b223a1..114a4e25a 100644
--- a/test/tests/zoteroPaneTest.js
+++ b/test/tests/zoteroPaneTest.js
@@ -177,56 +177,59 @@ describe("ZoteroPane", function() {
 		})
 		
 		it("should download an attachment on-demand", function* () {
-			yield setup();
-			Zotero.Sync.Storage.Local.downloadAsNeeded(Zotero.Libraries.userLibraryID, true);
-			
-			var item = new Zotero.Item("attachment");
-			item.attachmentLinkMode = 'imported_file';
-			item.attachmentPath = 'storage:test.txt';
-			// TODO: Test binary data
-			var text = Zotero.Utilities.randomString();
-			item.attachmentSyncState = "to_download";
-			yield item.saveTx();
-			
-			var mtime = "1441252524000";
-			var md5 = Zotero.Utilities.Internal.md5(text)
-			
-			var s3Path = `pretend-s3/${item.key}`;
-			this.httpd.registerPathHandler(
-				`/users/1/items/${item.key}/file`,
-				{
-					handle: function (request, response) {
-						response.setStatusLine(null, 302, "Found");
-						response.setHeader("Zotero-File-Modification-Time", mtime, false);
-						response.setHeader("Zotero-File-MD5", md5, false);
-						response.setHeader("Zotero-File-Compressed", "No", false);
-						response.setHeader("Location", baseURL + s3Path, false);
+			for (let fn of ['downloadAsNeeded', 'downloadOnSync']) {
+				yield setup();
+				
+				Zotero.Sync.Storage.Local[fn](Zotero.Libraries.userLibraryID, true);
+				
+				var item = new Zotero.Item("attachment");
+				item.attachmentLinkMode = 'imported_file';
+				item.attachmentPath = 'storage:test.txt';
+				// TODO: Test binary data
+				var text = Zotero.Utilities.randomString();
+				item.attachmentSyncState = "to_download";
+				yield item.saveTx();
+				
+				var mtime = "1441252524000";
+				var md5 = Zotero.Utilities.Internal.md5(text)
+				
+				var s3Path = `pretend-s3/${item.key}`;
+				this.httpd.registerPathHandler(
+					`/users/1/items/${item.key}/file`,
+					{
+						handle: function (request, response) {
+							response.setStatusLine(null, 302, "Found");
+							response.setHeader("Zotero-File-Modification-Time", mtime, false);
+							response.setHeader("Zotero-File-MD5", md5, false);
+							response.setHeader("Zotero-File-Compressed", "No", false);
+							response.setHeader("Location", baseURL + s3Path, false);
+						}
 					}
-				}
-			);
-			this.httpd.registerPathHandler(
-				"/" + s3Path,
-				{
-					handle: function (request, response) {
-						response.setStatusLine(null, 200, "OK");
-						response.write(text);
+				);
+				this.httpd.registerPathHandler(
+					"/" + s3Path,
+					{
+						handle: function (request, response) {
+							response.setStatusLine(null, 200, "OK");
+							response.write(text);
+						}
 					}
-				}
-			);
-			
-			// Disable loadURI() so viewAttachment() doesn't trigger translator loading
-			var stub = sinon.stub(zp, "loadURI");
-			
-			yield zp.viewAttachment(item.id);
-			
-			assert.ok(stub.calledOnce);
-			assert.ok(stub.calledWith(OS.Path.toFileURI(item.getFilePath())));
-			stub.restore();
-			
-			assert.equal((yield item.attachmentHash), md5);
-			assert.equal((yield item.attachmentModificationTime), mtime);
-			var path = yield item.getFilePathAsync();
-			assert.equal((yield Zotero.File.getContentsAsync(path)), text);
+				);
+				
+				// Disable loadURI() so viewAttachment() doesn't trigger translator loading
+				var stub = sinon.stub(zp, "loadURI");
+				
+				yield zp.viewAttachment(item.id);
+				
+				assert.ok(stub.calledOnce);
+				assert.ok(stub.calledWith(OS.Path.toFileURI(item.getFilePath())));
+				stub.restore();
+				
+				assert.equal((yield item.attachmentHash), md5);
+				assert.equal((yield item.attachmentModificationTime), mtime);
+				var path = yield item.getFilePathAsync();
+				assert.equal((yield Zotero.File.getContentsAsync(path)), text);
+			}
 		})
 	})