@vaapporr How much free storage do you have on your computer? You can see the values for all connected drives by opening a File Explorer window and clicking This PC in the left panel.
It sounds like you're using OneDrive and that the mods are stored there. But to be sure, please right-click on the Mods folder and select Properties > General, then list the full file path you see under Location. You can write [username] instead of your actual username if you want, but leave the rest of the file path intact.
