It's not like taking a photograph, of which you would in most cases be the undisputed author. I don't think there is section in the APA 7th edition style guide that specifically mentions screenshots, so this is my best guess. Psychology of citations: An ethnographic study. If you were taking a screenshot of this journal article, I believe you would cite it the same way, except note the screenshot format following the title. Journal Title, volume#(issue#), page span. So, for example, if you were citing a regular journal article it would look like:
However, in APA, square brackets may be used to add clarity when a source is unusual. Unless the content you are taking a screenshot of belongs to you, you should cite the source as usual, in order to avoid presenting someone else's ideas as your own (i.e.