Yes, Vivo Y93 does have the FM radio support.
Vivo Y93 does not have the front camera LED flash but it does have the display screen flash.
Yes, Vivo Y93 does have the portrait mode in both sides of cameras.
No. Vivo Y93 does not have the in-display fingerprint scanner. Fingerprint scanner of the Vivo Y93 is located on the back side of the phone.