You can remove unwanted attachments from issues on a schedule

To configure attachment filtering:

1. Go to Help Desk Administration/ Notification/ Filte trash attachments;
2. Turn on the toggle Turn on Filtering;

3. Filter by size (Kb) - Specify the size of the files to be deleted;

4. Images types - Specify the file extension to be deleted;
   
5. Go to Administration/ Sysrem/ Servises;
6. Add new servises

   1. 
      

      ru.helpdesk.jira.plugins.listener.FilterAttachService

      0 * * * * ?