Is it commercially available

[Quanna5FF3]

Do I need to tag the author when using photos on Instagram and YouTube?

[Abambo]

Yes or no! It depends! Study the licensing terms and decide accordingly. 

Look here for more information on licensing: https://community.adobe.com/t5/stock/links-for-licensing-terms/td-p/11366788
(Disclaimer: As always with licensing, this is my interpretation of the rules. I think they are correct and advice is based on reading and interpreting the licence terms and on fair use for both the buyer and the artist/stock company, but I cannot rule out that my interpretation is wrong. I'm not an Adobe employee).

[Quanna5FF3]

Thanks you.