Plotting a function defined by an integral

[cdecastro]

Noticed the following issue when plotting a function defined by an integral expression.

in CAS mode, I defined a function
f1:=(d)->int(x^2,x,0,d)

The function correctly evaluates at various points on the CAS home screen
f1(2)=8/3
f1(4)=64/3

Additionally, the following statement correctly places the function of X in the Function App window (plot symbolic screen)
F1:=f1

however, no plot is produced and the calculator indicates that F1 is undefined. Is this a limitation of the Function APP or am I overlooking something?

Appreciatively,
Chris