Process-download.php gets deleted as soon as I upload it

Are you able to see what the file permissions on that file are?

Unfortunately, no way: as soon as the FTP upload is over, the file shows up to half a second and then vanishes. Other files have permissions 644.

Who is your host?

It’s Netsons: https://www.netsons.com/ (I’m Italian…)

Does the host have any security settings that you can control? I think your host is detecting the file as potentially malevolent, do to one of the functions the file uses.

Could you ask your host if the file is getting flagged as malicious?

That would account for it… The admin area runs cPanel, there’s not much that I can do, or at least that I see… What is the possibly indicted function, to tell the host?

Thanks, really!

The function is base64_decode() and or base64_encode().

No, that can’t be the reason. My very plugin uses those functions and it works. I filed a support request asking them if the file is somehow marked as malicious, I’ll keep you up!

They said that yes, maybe the antivirus might be to blame, and that they will try to deactivate it on Monday.

Great, let me know if it works!

They deactivated the antivirus and it works now (or seems to at least). I really don’t know what hell of an antivirus they might be using, since virustotal reports it to be fully clean…

Thanks a lot!

Glad to hear it!