Your mileage may vary depending one your OS and what you use. On Windows menu File>Share or the icon it Photoshop top right corner show pop-up a share selector. On Windows I see eight possible selections
Facebook: This seem to work but I doe nor actually use my facebook account.
Feedback Hub: This open Microsoft Feedback hub and the Photoshop document is included:
Lightroom Photo: Lightroon is not on my system this fails.
Mail: This wants to open Microsoft Mails not my mail application. So I use my Photoshop email script.
Cortana: Seems to want to setup a cortana reminder withe the document image. I do not use cortana.
OneNote: OneNote open ant there is some soe of meaasge to select a section ant then try share again. I doe not use OneNote seems to come with Windows.
Skype: Start up Skype with document displayed in Skype. Skype is installed by Windows 10. I do not use Skype.
Twitter: Open a Welcome to Twitter dialog that lets you sign up for an account or sign in. I do not use Twitter
If Mail started the correct application it would be better. If Windows File explorer can start the correct email application why can't Photoshop.
I tried Facebook and it worked, and I got the Instagram App from Windows store but it won't work to share photos on Instagram.
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Instagram, my understanding, has only allowed users to create new posts using the official Instagram app on your mobile device. There are some options for posting images from a desktop using third-party apps, but none are officially supported. Using them runs the risk of being "shadow banned" which stops your posts from showing up in hashtag or location searches for a period of time.