Please visit Dashboard->MediaPress->Galleries and see if there is a link for trashed items. Either restore them or delete them permanently.
That will make it work. Please try uploading after that and let me know how it goes?
My apologies for the delayed reply.
Can you please create a new user account and try uploading with that account? What do you see then? Is it working or not?
If it does not work for this account, I will need temporary admin access and will check/update settings on your site. There may be some conflict if it does not work.
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