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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2014-10-16T18:09:08.023
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2014-10-20T09:59:14.370
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loanwords
What does 「アップしています」 mean?
アップする is a 和製英語/abbreviation meaning "to upload".
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2014-10-16T18:26:28.747
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2014-10-16T18:26:28.747
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answer
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).
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2014-10-16T18:27:26.363
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2014-10-16T18:39:48.793
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answer