I am currently making a Power App and need some help.
I want to make cascading dropdown on my sharepoint list.
I used the create app from Sharepoint List option that gives generates the three screen app and connects the data automatically.
I have all my column as choice columns.
First choice column is simple with 9 data values but second and third have 40+ values each.
I need to be able to choose the first column and filter out values for the second column.
Then, I need the third column values to be based on the result of the second column. 
Please help me figure out a way to make this work for my team! I have been trying for days now and nothing.