In the self-hosted version of activeCollab, the maximum file upload size is not limited by the application. The limitations are enforced by your web server and activeCollab only displays the current limit on forms that allow file upload:

To increase the maximum upload size, open the php.ini file and change the values of upload_max_filesize and post_max_size directives to the desired value. For example:

1
2

upload_max_filesize = 64M
post_max_size = 64M

Save the php.ini file and restart your web server. If you do not have access to the php.ini, contact your system administrator or hosting provider to increase these values for you. You can point out that they need to be applied to the /public folder. Do not forget to restart your server after the changes in the php.ini have been made. If you skip this step, the maximum upload size change will not be applied.