Punching bag mounted on ceiling in flat
If photos 6/7 are indicating you have some kind of dropped ceiling, then you definitely cannot attach this to the dropped ceiling. It won't support any load.

Best option in that case is to build a free standing structure and hang your bag on that. A couple of A frames and a beam going across the top where you'd attach the bag would be easy to build. Use a few bolts for the assembly and it would also be easy to disassemble and relocate. Keep the span of the feet wider than the maximum swing of the bag to avoid having it tip over.