Slide floor separating

I have this floor separation problem too! I have taken things apart - sofa out, carpet pulled up, and the water damage is negligible. I was told by an RV repairman to just clean it out, slap a lot of glue in there and then clamp it. If you can see past the metal bar, there's OSB above the gap and plywood below. That's what I'll be gluing.

He suggested getting a length of 90 degree steel from Lowe's and using that on the front edge.