IPhone won't let me change my phone wallpaper?

So my iPhone's been acting up lately, mostly because of me having practically no storage left on my phone. Anyways, I wanted to put my school schedule as my lock screen. But when I tried to change it, it didn't do anything. I even tried changing the home screen. Nothing. I reseted it and tried again. Nothing. I even fully turned it off and tried it. N.O.T.H.I.N.G.
Any suggestions would help me out.

It probably doesn't have enough space. Delete something.

Try saving as a different file type such as jpeg, tiff, and pdf respectively.

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