Has Dropbox Dropped Samsung?
Due to recent product updates, as of April 1, 2018, you’ll no longer be able to access your Dropbox files and photos via Gallery or My Files on your Samsung device. Dropbox will also no longer support syncing to the Samsung DocumentSync folder.
Not to worry—your files won’t be deleted or modified as a result of this change, and getting to your Dropbox files is easy. To view, upload, or organize your Dropbox files, download the Dropbox app from the Google Play Store.
For more information on this change, please visit the Dropbox Help Center.