Can't add an external repository ... again

Hi guys!

I've updated my membership to gain access to the new version of Snapshot Pro. I've been waiting a lot for the external repository solution (since the version 2.4) that wasn't working then.
Now, that I upgraded all, the plugin is not working as supposed to be working.
Could anyone tell me why Dropbox, Google Drive and FTP can't be added easily and there's no problem adding your repository?

P.S.: Don't forget that the Snapshot has to be uploaded automatically, which is also not working. (Last time Remote Support added one repository, don't know how they did it and they didn't tell me how to do it .....)

Thanks in advance!