I’ve been having an issue with the drop uploader. I already created a post with the same problem months ago and you updated your plugin. It seemed to work better or at the very least it did not occur until recently.
As a reminder, the files uploaded by the user are sometimes non-existent on the server.
The link is displayed in the submissions listing for ninjaforms but when you click to access the file, it’s either 404 if not connected as admin or another random url.
When I check the files in the upload folder through FTP, the folders are empty so I can confirm you 100% that the files don’t exist even though the folder for the entry has been created.
The most recent example is on the “Page recrutement” form and it was an entry submitted january 14 at 10h37.
I have created an admin account so you can check the issue directly on the website.