I am running 1.3.9 portable on Windows 10. I have imported about 2.3 GB of data from Evernote. The notes display fine in Joplin, and the attachments (images, PDF, Zip, etc.) are in the JoplinProfile\resources\ folder.
I followed directions to setup Dropbox sync. It seems to finish syncing, but all of the data is not there, in Dropbox. I see 1438 .md files in Apps\Joplin, and 11 files in Apps\Joplin.resource. The number of files does not increase on later syncs. The entire Apps\Joplin\ folder only totals 33.6 MB. It looks like none of my attachments are syncing.
I am not using encryption (yet). I get no error messages. The log shows no errors.