What if the file transfer fails?

I have encountered such a situation for the following reasons.

File is too large

Your file is very large, while others have insufficient memory.

There are too many transfer records.

Is this how you pass files to everyone? If not, this person has too many file transfer records. Tell him to delete all the records of file transfer in his mobile phone and try again.

There are too many transfer records.

It may also be caused by too many file transfer records in the mobile phone. I don't think it's possible because you passed it on to others.

Bluetooth failure

Your phone or the other phone's Bluetooth is broken, so it doesn't work well.