Sharing folders

Hello

Can someone save me pease from going mad!  I was able to share my folder between my old and new computers  for few days after installing W11 and having trouble sharing.

Now it suddenly stopped for no reason. I have not changed or played with anything. I went through all the advice available in Communities/videos/ microsoft support.... from ensuring internet the same, discovery on, advance sharing, permission.......etc. I did that several times in vain .

For work reasons I need to work on different laptops in different rooms (same internet).

I have a deadline and I need help please! Thank you

MohgaKY"gmail.com