Thanks for your response. In retrospect, I think it was a mistake to purchase MSFS through Steam, mainly because of the conflicting info found by google search as to where the Community folder is located. I found many online references that said that after a Steam install you should put mods into:
User > AppData > Local > Packages > Microsoft.FlightDashboard_randomnumber > LocalCache > Packages > Community
For me this didn’t work; however, the Community folder location suggested by SierraHotel2873 did work (thanks again!). So I have an installation with two different Community folders, only one of which works for Mods.
I do not have a SteamLibrary folder. But I do have:
LocalDisk (C:) > Program Files (x86) > Steam > steamapps > common > MicrosoftFlightSimulator > Packages
However, there is no Community folder located there. I can only assume that during a Steam MSFS installation, the creation of the Community folder(s) is based on some other variable, possibly something unique to my system.
I greatly appreciate the comments of this Forum’s participants, without whom I’d still be trying to figure out why my mods don’t work!