LG G5 text notification doesn't repeat

[AC Question]

The text notification goes off once but will not repeat. If I'm on-call, i need the text to alert and wake me up at night until i open it. Where is this option located on the LG? Thanks!

 

[Nick Russell]

The text notification goes off once but will not repeat. If I'm on-call, i need the text to alert and wake me up at night until i open it. Where is this option located on the LG? Thanks!

Settings > general > accessibility > persistent notifications