What I want to happen is for the player to be able to see the hex that her token is in, plus all the adjacent hexes. When she moves her token, it should show her the new hex, and any adjacent hexes. The basic FoW options are set up to assume that you're in a encounter-scale map, with standard vision rules (60 ft darkvision, for example). When I initially set it up, any token with "Normal" vision would automatically reveal the entire map as soon as it moved a single hex.
I tried to fix that by defining a new vision type in the campaign properties, thus:
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Limited: circle distance=2.5 r3
At least, that was the idea. What actually happened is that the player slowly lost the ability to control her token over the course of the session. Snap to Grid is turned on, and it kept snapping to undesired hexes. Initially she would just wind up going too far or not as far as she meant to go; but by the end of the session, her token was showing a strong bias towards snapping back to its hex of origin every time she tried to move it. Eventually she would just tell me where to move her token for her, which I would do, then switch to the fog tools to reveal the map, then back to the token tools to move her token again, then back to FoW tools ... and so on.
At one point, I dropped an unrelated token on the map -- the big-bad needed to make a will save vs a scrying spell -- and then moved it, whereupon the map was fully revealed because the big-bad had Normal sight rather than Limited. My player had to look away from her screen while I reset the fog and manually redid her path to that point.
Finally, at the end of the session, something weird happened, and the Fog of War almost entirely reset itself. Most of the areas she'd explored reverted to unexplored, leaving only a few isolated islands revealed.
I just don't know how to make this work, and I'm pretty sure I'm making all kinds of ridiculous newbie errors because I've never really used FoW in the last four years of play. It was never needed before -- but I wanted my player to have to do some exploration on this particular map rather than instantly noticing the points of interest and bee-lining straight for them.
What do I need to do to make this work?
I attached a campaign file, then noticed the thing saying not to do that. But I couldn't find any way to delete the attachment before posting. Sorry. I did go through and delete all of the other maps first, though -- it's only got the one in question.