How can I combine these faces in Blender?
I’ve tried Mesh Clean Up Merge by Distance, Tris to Quads, and Beautify Faces but I can’t seem to get these faces to merge.
I built the model in Roblox Studio so they are different parts.
I’d delete a vert I don’t want and then re-made the face for whatever gets broken in the process.
selecting 3 or 4 verts and pressing F in edit mode should be the shortcut to make a face.
that’d be cause the other stuff doesn’t work. 
3ds max has collapsing verts and stuff, but it’s not the same in Blender
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You’re better off exporting them as glTF instead from Roblox to Blender.
Try pressing K on the area you want to select.
You most of the time don’t really need to have faces connected unless you’re really pessimistic about shading.
Separate them and try using the Boolean Modifier set to union. (oh wait i did not mean to reply to you)
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