You don't need to use the official Mastodon apps, they're not the best way to use Mastodon. The official apps only arrived last year, and they were intended as "Fisher Price My First Mastodon" things with a restricted set of features.
Third party apps have been around longer than official ones, and include way more features. You can sign in with the same account on all apps.
On Android try Tusky, Fedilab, Megalodon, Tooot
On iPhone/iPad, try Toot!, Ice Cubes, Ivory, Mona
@feditips hey, I am new to this.
Can I post photos to pixelfed from my mastodon account???
Hey there!
All you have to do is post them on your Mastodon account as normal. People on Pixelfed can follow Mastodon accounts, and people on Mastodon can follow Pixelfed accounts.
For example, @Iancylkowski is a Pixelfed account but you can see and interact with it entirely from within Mastodon. From your point of view it will look like a Mastodon account, but to see what an account really looks like on its own server, look at its original page: https://fedi.tips/what-are-original-pages-in-mastodon/