I encountered issues with max URL length when setting up URL for App chaining with multiple selections. When the URL is shorter than approx. 450 characters, its working fine. If URL is longer than 450 characters, I am getting following error from web browser.
Bad Request - Invalid URL
HTTP Error 400. The request URL is invalid.
I have tried different browsers (Chrome, Firefox, IE) and ended up with the same error message. I am using Qlik Sense 3.2.1. There is limitation for web browsers max URL length to 2048 characters, but my URL consist approx. from 810 characters.