質問: For example: > > Youtubeで動画をアップしています。 > > > Does 「アップ」 mean “upload”?
回答: As you guessed, アップ is short for アップロード meaning upload. Adding する makes it into a verb. ~ている has a lot of uses so I will just say without any further context 「YOUTUBEで動画をアップしています」 could be 'I upload videos on youtube' (repeated action), 'I have videos/the video uploaded on youtube' (resultant state) or 'I am uploading a video on youtube' (continuous).