I select an animation for my Rig and it loads indefinitely

currect:

• open in your 3D software of choice, remove the current bone rigs, put the arms in T pose and adjust the legs to have a gap
• export as obj, zip, upload and set rig to no hands... easy

Despite the fact that Mixamo has been presenting serious problems since yesterday, your modeling does not have defined arms or legs. The limbs should be separated from the body in position "A" or position "T".