FIG. 1 is a top perspective view of a folding storage cabinet, showing the new design;
FIG. 2 is a bottom perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a back view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof;
FIG. 9 is a top perspective view of a folding storage cabinet in a folded position;
FIG. 10 is an enlarged detailed view of encircled area 10 in FIG. 1;
FIG. 11 is an enlarged detailed view of encircled area 11 in FIG. 1; and,
FIG. 12 is an enlarged detailed view of encircled area 12 in FIG. 2.
The broken lines represent the portions of the article that form no part of the claimed design.