Getting started

I have attempted several ways to upload a photo and it continually tells me the file is too large.  Open the REFMED worksheet which populates from entered medical expenses.  I am currently working on 2 separate tax returns.  One file has the calculated $amount on line 19 and zero on Line 20 so should do the math calculation to be 19 minus 20 and populate Line 21 to carry over to T1 General line 45200.  On the other tax form there is a $amount on Line 19  greater than the $amount on 20 and still does not do the math calculation to carry forward to line 45200.