I'm not a wild life photographer by any stretch of the imagination, but photographing the 'urban' or town Foxes is a different game to catching their country cousins on camera.
Both will respond to bait but..town Fox will generally ignore your scent unless you're too close to the bait, but in the woods you will have more success if you consider and act on wind direction. If you know where their Earth is you can lay your bait and then get down wind of Earth/bait.
If you can, get off the ground, you don't need to get too high but dogs/ Foxes work to air and ground scents, getting up higher, even on a fallen tree will help.
I was on this fallen trunk so she picked up my scent slightly later than she normally would because I was down wind and slightly higher, also, she hadn't crossed the ground track I'd left going to the tree so I'd left no ground scent.
They were taken from one of my regular perches, not high, just downwind and keeping still (even when you think nothing is about)...
A split Hornbeam I use as a seat.
Sometimes the unexpected occurs...camped in the wood I heard the squeaks and growls of Fox Cubs scrapping in the nearby Ferns and just managed to get them in the fast fading daylight.
Brother and sister I believe...
People more knowledgeable than me about animal behaviour may not agree, but it's possible that the Vixen in my photo very likely knows my scent. I sleep in the wood 6 or 7 nights every month of the year, often more. I know her, so it's likely she knows me and knows I do not represent danger. Once she had seen me, she acted almost like an urban bin raider who waits for the Postman to go by before having last nights Big Mac left overs for breakfast...
Watch the wind..keep still..and good luck.