Hi @Anonymous,
Do you mean that the dynamic content Ask in PowerApps disappear in your flow configuration?
I have created a flow which is triggered by PowerApps button, however, the issue you mentioned could not be reproduced.
In the upper-right corner of Dynamic content, there is a See less/See more tab, by clicking which you could see less/more dynamic contents that are available.
Have you tried clicking See more button to see if it will work for you?
Best regards,
Mabel