I have a file_advanced field in a cloneable group.
The Problem: Sometimes the file just disappears.
I personally haven't been able to replicate the issue. This is a client website and I asked her to walk me through the steps and everything seems fine. She always see's the file on both the front and backend after checking her work to make sure it was uploaded. Then sometime in the days following, she notices that they are missing.
Maybe please ask your client not save/update the posts when the files are not full loaded. I mean when you edit a post with file_advanced field, you have to wait for 1-3 seconds to see all files are loaded. Only until then, it's safe to update the post.
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