probably your save file is corrupted. i had no problems reusing older saves. neither on mac nor on windows
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that's odd. it seems either the directory that specifies where the save files are stored changed somehow, or you moved them by accident. it's hard to give precise steps for troubleshooting without information tho. i assume you're either playing on android or windows? normally the saves are stored either inside the game folder or a dedicated renpy folder.
I'm playing on Android. And I didn't have any folder called save, so it downloads directly to renpy-saves>lucky.paradox i even made a save folder in thatffolder and it didn't read them. Examining it now, I can see all the files created from my new save. And they aren't named differently from the one I snagged from the discord. So idk.
the directory for the saves are specified in many scripts of renpy and python, so if you changed their location by creating a subfolder in the original location, the game won't find them, since it doesn't know about said folder. try moving them into -as you said- /renpy/saves/lucky.paradox out of the folder you created. then restart the game and see if they are visible. if not, details of what you already did and tried, or changed could help too