There is a display issue related to using custom tag images which will be fixed in the next release - if you want to get a notification when the fix is released please open a
Support Ticket with a link to this thread.
Once that is addressed, you can add custom tag images like this:
(Adding custom tags like this will work now, but you won't actually see your tag image in the reports, so isn't yet a complete solution. You can filter by your custom tags though.)
If you put image files in the PT4 User Data Folder structure they will be used in preference to those in the Program Files folder, and these will not be overwritten when you update PT4.
To access this use the PT4 menu File > Open User Data Folder and go to the 'Data' folder.
Create a subfolder called 'Images', and then within that create one called 'Tags'. (This mimics the folder structure in the Program Files folder)
Any image files you place here will be available (after you restart PT4) in the tags configuration.
You can re-use the existing image names to overwrite existing images too, if you like.
Your image files must be 16x16 png files, like the existing tag image files.