
You could check this through audit logs. Here're steps:
1.To enable audit logs in the Central Administration. Go to Central Administration -> Application Management -> Manage service applications -> Select the Secure Store service application -> On the ribbon, click Properties -> In the Enable Audit section, click to select the Audit log enabled box.
2.Go to the document library -> Library settings -> Information Management Policy Settings -> Select the Document content type -> Enable audit logs.
3.Go to Site settings -> Site Collection Features -> Activate Reporting feature.
4.Go to Site settings ->Site collection audit settings -> Choose Editing users and permissions in the Lists, Libraries, and Sites section.
5.Go to Site settings -> Auditing log Reports -> Custom report -> Choose Editing users and permissions in the Events section.
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