That Attachments Limit Plugin
Pure Redmine allows maximum 10 files to be uploaded at once. This is a well-known limitation (see #18556).
That Attachments Limit plugin makes this limit configurable (Administration - Plugins - That Attachments Limit - Configure):
that_attachments_limitdirectory to the
pluginsdirectory of Redmine
- Restart Redmine
GNU General Public License (GPL) v2.0