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Today I created an exercise with an activity and a pdf file for my Group. When I reopened the exercise, the activity and the pdf were double. I removed one of the two copy of the activity but both disappeared. Furthermore the activity was deleted from my resources in Material Platform.
The same problem 
I have looped your issue to the Support Team
thank you
Please post the link
I can't find the link. I removed the activity from an exercise and it was deleted in my Resources
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