Frigate media recordings not playing on 1 android tablet but working fine on another

frigate media recordings not playing on 1 android tablet but working fine on another
tablet
opens but will not play
frigate displays live cams on both normally

check that android system webview is fully up to date in the play store

Hi
had checked that it was up to date ,
have 4 cameras , alll different types and ages 2 most resent are Amcrest 8mp and Annke 12mp
Deleted the Webrtc card for one , then reselected it from the lovelace seltion
put url back as was
Camera now appears initialy as a MSE but changes to RTC
repeted this with 2 others all working
however the 4th which is the Annka 12mp still will not come up on the mobile
tried using the downgraded detection stream still no sucess
also working as above on 1 android tablet (newest) but everthing is and has worked on the oldest tablet !
will keep on with the task !!