Not working with bigger files - Unknown Error

Frank Schroeder · 2025-07-28T11:23:39Z

Hi I just bought this addon to have the possibility to attach multiple files to my forum entries. Unfortunately it doesn't work: When using attach files I see in the top right of the page a spinning icon which disappears after some seconds. When Using My Media I see he starts uploading till about 30 MB and than stops in Error Unknown error In my PHP and Apache error logs I see nothing - the upload limit in PHP and the Forum is set to 16GB so that shouldn't be a problem neither I tried a dmg and an exe files with about 270MB and those don't work Tested with smaller than 30MB and those work - so somewhere seems to be a problem with maybe a timeout or so but as I have nothing in my logs?

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wpForo Advanced Attachments

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Frank Schroeder

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Aug 07, 2025 12:41 pm

(@frank-schroeder)

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Joined: 8 months ago

Hi
sorry for my late reply - had some very busy days :/

This is what I have installed on my server:

Perl version	5.032001
Path to Perl	/usr/bin/perl
Python version	3.9.21
Path to Python	/bin/python3.9
BIND version	9.16.23
Postfix version	3.5.25
Mail injection command	/usr/lib/sendmail -t
Apache version	2.4.62
PHP versions	8.4.11
Logrotate version	3.18.0
MariaDB version	11.8.3

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Astghik

Admin

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Joined: 8 years ago

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Posts: 6645

Aug 28, 2025 2:23 pm

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Frank Schroeder

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@frank-schroeder

We checked your message and the PHP values you’ve already set are high enough, so the issue is not related to PHP limits.

The Advanced Attachments addon works fine and allows uploading large files over HTTP/1.1, but once the server is switched to HTTP/2, only smaller files can be uploaded. Large file uploads fail under HTTP/2.

This looks more like a server or HTTP/2 protocol limitation (buffering, timeout, Nginx/Apache configuration, or proxy settings), rather than a wpForo issue.

Please contact with hosting provider.