I use the Joplin cloud and I got a warning that I am at 80% usage.
I use both the Joplin 2.10.18 for windows and Joplin 2.10.8 for Android.
I would like to purge some of the notes that are the largest file sizes.
Is there an easy way to find these large notes so I can delete the images attached to them to reduce the overall Joplin data file?
You can check for the largest attachments at your windows client by Tools -> Note attachments... -> Sort by size. Not sure what the best workflow would be for deleting the attachments and not creating broken links at the notes, though.
Joplin's versioning feature which you can configure in the desktop app: Tools/Options/Note History. If there's a figure other than zero, deleted notes will still occupy storage space for the determined number of days AFAIK. The sacrifice depends on how often you edit your notes, i.e. how many versions you have (if you allow them to be saved).
it is hard to say, I set the note history to 30 days, deleted a bunch of old notes, and deleted out a bunch of overly large pdf and jpgs from some notes. That dropped the file size usage on the joplin cloud by 25%.