H1B transfer without I-797B and other documents

hallow Experts
I have only I797C for H1B and when I check online my petition is approved. But my employer is still not sending i797B and all documents so I am not able to book visa interview appointment .

My question is can i change employer and transfer H1B with only I-797 C and screenshot of approved petition.? these 2 documents are enough to H1B transfer process. ?

You just need the copy of the approval notice, but yes you can use the print of screenshot approval notice for transfer.