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Failed to detect file type when using a stream as input

Hello,
I came across similar error on .net v 4.6.1.
When I upgrade GroupDocs.Merger to Version 22.1 and use stream as input I’m getting this error:
GroupDocsMergerException: Failed to detect file type.

@YuliaF

This issue is already under investigation. Your investigation ticket ID is MERGERNET-1204. We’ll notify you in case of any update.