For example:
Youtubeで動画をアップしています。
Does 「アップ」 mean “upload”?
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Sign up to join this communityAs 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).