Import partition

Hi
I'm an Harmony musician and when new material (partitions) come to me they are in PDF mode,
due to my vision problem ,I have re -written them all so far cause I don't know if I can import these partitions from my computer directly to Musescore.
If it's possible to do so (I imagine there is a way) please can you help me with the route to follow.

Thanks
Gilles Gauthier