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....Failed to detect file type when using a stream as input GroupDocs...GroupDocs.Merger Product Family YuliaF April 13, 2022, 1:39pm 1 Hello...