BG96 Get file size

IoT Modules LPWA Module
1

Hi All,
I try to get file size on file system.
First command is AT+QFSEEK=2,0,2 - move to end of file. Result is ok.
Next command is AT+QFPOSITION=2
Result is ok. But pointer is wrong. Why?
If try AT+QFSEEK=2,-1,2 I always is given an error 400. Is ok?

2

If necessary I can send you the related document.