Record of Marketplace purchases?

I wish that i had known this. I wonder if the best course of action would be to try to somehow cancel my steam msfs, (and possibly get a refund) and then re-purchase Msfs through Microsoft. To me this seems risky and convoluted — just to retrieve my two or three marketplace purchases. Given this experience, I am inclined not to use the marketplace in the future.

Anyone have any suggestions? Am I correct in assuming that future addon mods (pay and fee) will work with my steam msfs download?

NanooseGuy