The Windows explorer can be used to create folders within the Strive program folder instead of waiting for the mod system to create them. There are folders within ".../Strive/mods/AricsExpansion/patch/" that do not correspond to folders within the Strive program folder. For instance, in "res://files/aric_expansion_images/abils/panic.png.import" from the the errors you just gave "res://" refers to your Strive program folder, which contains the "files" folder. However there will not be the folders "aric_expansion_images/abils" within that folder, so the panic png.import file cannot be copied to there.
Edit: Many of your errors are a missing folder in the backup folder "res://backup/.import".
If you downloaded Strive from somewhere other than itch.io then it's possible your game folder is corrupt, which would explain the contradictions in how the mod system interacts with your Strive program folders.
Otherwise there have been rare cases where a computer has weird permissions everywhere and the best solution is to put the game folder in the roaming folder beside the game's user data folder since this usually provides all necessary permissions to edit files and folders.
