Add ons

On the website it says you can add add ons on mobile but I can’t. I can’t open Adobe express as a webpage as it always loops me to my app. I am wondering how to accomplish this. I’m also wondering if you add an add on on the web version if you can later use it on the app. Even canva lets you add add ons in the app. This is a mistake on adobes part for people that mostly use mobile and I can see it pushing people to use canva. I’ve grown to really like Adobe express but things like this frustrate me as a paying customer.