Hi! I recently released a game for $20, but for an extra $5, the players can get access to a bonus PDF.
The problem is, a lot of people don't notice the art book tier and buy only the game, later telling me that they meant to get the art book as well. However, they can't seem to pay only the extra $5 for just the art book through itch io's system. The system forces them to pay $25 instead.
Is there a method where players can just pay a little extra later to get access to the higher tier? Thanks in advance!