Black blood vs mucous?

Looking for a bit of help. Lately doctors can't really tell for sure if I have crohn's or UC, so I'm looking for some thoughts. Here's the info. First few flares were straight UC, rectal inflammation all the way up no skip lesions. Blood tests indicate UC not crohns (still do). 10 year with disease. But last few years I've had I've been having 'skip' inflammation on colonoscopies. I'm not flaring per say. Solid stools mostly, but always tons of mucous, Definite pain, diarrhea every few weeks, occasional red blood in stool. It's just not going away. Dr says its either because of my enemas giving patch coverage towards the end of their reach, or that it's crohns. Over last few months though I've noticed occasional black specks in my poop. Kind of like sprinkles? Last couple days there's been some black 'mucous' textured stuff wrapped around my stool. Not in it though, just around it in the cracks/ridges. And the actual stool color is light brown, or regular brown. I don't know if its black digested blood from upper GI, some weird colored mucus, something I ate?

Looking for some thoughts from you guys. I know in my mind I'd rather have UC but denial doesn't help anyone...

Meds -
Allopurinol, mercaptopurine combo
Humira 40mg/inject 2x week (80mg standing in blood)
Mesalamine enemas 1-2x weekly
VSL3 probiotics

Hey Sam, how is your physical activity? Do you exercise often?
I have UC and I actually came here today for some opinions myself, I have been in a flare for 3-4 months now, finally my poops are formed but my rroids are extremely enlarged but thats another story. So i too have seen what you describe, sometimes i saw dark tarry matter mixed with mucus in the cracks of the stool. But it was not consistent. And i was doing mesalamine enemas when that was happening. Now i’m doing hydrocortisone Enemas and they did wonders for me - trying to taper off them.
Check this out now. We had a snow storm and yesterday all i did was shovel snow all day. A very active day compared to my sedentary past 3 months. Today stool was covered in white mucus .. never seen that much. But man I feel great from all that snow shoveling. So idk if this excess mucus is good or bad - i’m still doing 1/2 hydrocortisone enema every night which my intestines absorb completely. I’ll be doing more shoveling today 😂