OneDrive Personal Shared Folder Email Digest Summary
SUB-FOLDERS and FILES added by OTHER USERS in a FOLDER THAT I SHARED does not reflect in the notification email - only changes to existing files reflects in the summary.
Even though other users owner of the files - I am still the owner of the folder - and this qualifies as changes to this folder surely.
If anyone has a workaround in the interim then please inform - support says feature not supported.
the subject of email says "... and 10 others edited your shared files"
the number appears to be the number of edits - not the number of users that edited the files.