Please check the following.
Settings->Globals->Functions->Apple Pencil Drawing. Turn it on temporarily and press the i (info button).
If any of these options are on, turn them off:
Cannot draw on some PDF on older iPads
Tag: drawing
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Turn on Apple Pencil Drawing temporarily, then press the i button. Turn off Pencil pressure and Finger erases, if you have an old iPad without Apple Pencil support.
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