phpBB: Unable to add attachments to posts with PHP 8 or higher.

Hi there,

I've found I'm unable to add attachments to posts with PHP 8 or higher on Altervista, even though this issue doesn't occur on my personal website which uses a paid host.

If I use PHP 7.3, I get a green tick next to attachments after uploading them, but on PHP 8 or higher I get an exclamation icon and the attachments don't appear in the post after I click submit.

I can't see anything in phpBB's error log in the ACP, so perhaps someone could look in the logs for an error at roughly 2:57 PM on Fri Mar 20, 2026?

I did report this some time ago but never got a resolution, however it's more important now that PHP 7.3 is being removed soon.

Best,
Hamish

Hello,

Could you please let me know which version of phpBB you are using? I'll try to reproduce your issue on my side.
Have you tried updating phpBB to the latest version? (after a full backup).

Thanks.

Bye!