Conflict with pluging 'WP-Filebase'

with plugin WP-Filebase 0.3.0.02
When I add a file (analyse72_102017-00049051.pdf 40k) from the File Manager Dashboard WP, it is not visible in the manager. it displays
All (1) | Own Files (1) | Offline (0) | Not Attached (1) 1 item

But the list below is empty.
So I can not edit the settings of it or delete it!
Same problem when I add other files.
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Yet on the site, we can see the files, and you can download them.
By disabling one by one my plugings installed, I found that the problem:
This is the plugin ‘WordPress Backup to Dropbox’ v 1.7
How can we resolve this conflict.
Thank you for your help.

http://wordpress.org/plugins/wordpress-backup-to-dropbox/