I wouldn’t jam this on the flop unless my flush had more backup. Especially true at these stakes I think population tends to be value heavy with their check raises, or at least nut fd with their semibluffs.

That being said with middle pair and second nut fd and some backdoor straight potential i’d call flop. Turn is ok since it gives us nut straight outs, but once he bombs the turn for pot i’d fold. All in all, I play this the same.

Check back the flop.

Your hand has pretty middling equity and doesn't love facing a x/r, so I prefer a check back like stianchrister suggests. If you tend to bet too frequently in spots like this with combos that are similar to your holding you will not only be prone to x/r's that put you in tough spots, but you also will have a really weak check back range. I would suggest actually polarizing a little more in that spot as you will be prone to being attacked on that type of texture when your perceived range is a little wider on the button as well. You want some combos that can take some heat vs turn stabs.

I think you actually played it well after the flop cbet though. I think your combo works better as a call vs the raise and although I think it's somewhat close on the turn I believe it's slightly a fold. I think you have around 30% equity vs what I assume his range is.

Grunching.

I think this is a bit loose preflop, even for the button. Not hideous, but far from a mandatory RFI imo.

Bet/calling flop is also too loose. I think you want to check this back for the free card and some pot control, as you have very few routes to the nuts.

As played, I see no reason to do anything but fold on the turn.

Solver has it as bottom of range for RFI. The only worse hand being opened is KJ54ss, but it has KJ64ss as a fold. It starts opening when the bottom two cards are gapped at KJ75ss and folding vs 3bet, only calling if the bottom two cards are connected or once we get to KJ97ss. This is considering micro stakes rake. Also if it's not K high suit then it's a fold.

But if you are new to PLO you will be more prone to post flop mistakes so you could toss it until you are more comfortable with your game.