In Yahoo Photos how can I put a caption on a picture?

In addition to the file name, or is the file name the caption?In Yahoo Photos how can I put a caption on a picture?
In newYahoo Photos, when you upload a photo to your collection/albums, or subsequently, you have the options of filename, short Description, and additionally, lengthy Comment.





(If you wanted a caption inside the photo itself, you would have to do this before uploading.)

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