My edits don't appear in a file I synchronized on my Android device
When you choose to auto-synchronize a file on your Android phone or tablet, the file on your device is kept current with the file that's stored in the cloud according to the update frequency you specified. When the file in the cloud is updated, the copy on your device is automatically updated, too.
If you edit the file using another app on your Android phone or tablet, its counterpart in the cloud isn't updated automatically. You'll have to upload it to the cloud to update the copy there.