I had a similar issue, eventually managed to use the following solution.
Create a file system repository in Moodle and move your files there after they have been uploaded to your server using a method outside of Moodle. The repository directory is in your moodledata directory.
Go to the restore menu item as normal but click 'Choose a file...'.
Select the file repository you created, choose the file and continue your restore as normal.
Regards
Backup and restore
Import course in 2.6
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