Finally! Thank you so much, it works fine.
I try also to configure smb/cifs but I get the error "Unable to mount disk to NAS server, folder is invalid". The ipcam is DS-2CD2042WD-I
With a raspi2 / omv3 smb/cifs it works fine.
With windows 10 and omv5 the file's share works fine.
The raspi4...