Folding only adds numbers together, so the total never changes. Both strips add up to 53. Your largest target number, 26, must be a stack of several cells added together.
Hint 2: the length budget
The strip has 10 cells and the target has 4, so the folds together must remove 6 cells. A fold removes as many cells as its shorter side has.
Hint 3: the first fold
The first fold goes between cell 9 and cell 10, counting cells from the left.
Full solution
Show every fold
Fold 1 of 4
3432846986→3432846914
Fold between cell 9 and cell 10. The right side flips over the left side.
Fold 2 of 4
3432846914→343284623
Fold between cell 8 and cell 9. The right side flips over the left side.
Fold 3 of 4
343284623→3426812
Fold between cell 5 and cell 6. The right side flips over the left side.
Fold 4 of 4
3426812→342620
Fold between cell 4 and cell 5. The right side flips over the left side.