Hello, @xiagao
Based on the result you shared, we can see the different permission between mymattermostplugin and jira for example:
drwxr--r-- 5 mattermost mattermost 4.0K 12月 17 09:21 jira
drwx------ 2 mattermost mattermost 4.0K 12月 16 15:53 mymattermostplugin
Can you please adjust the permission accordingly and then verify that it is the same as jira and zoom before activating again?
sudo chmod g+r, o+r mymattermostplugin
Eventually, we should have something like this:
drwxr--r-- 5 mattermost mattermost 4.0K 12月 17 09:21 jira
drwxr--r-- 2 mattermost mattermost 4.0K 12月 16 15:53 mymattermostplugin
Please check on the Plugin Uploads Fail Even Though Uploads are Enabled article as well for further troubleshooting.