Any cheap, folding, full-suspension bike is going to be more trouble than it is worth.
Cheap full-sus bikes are not genuine MTBs. The massive tubes look strong but the weakness is at the thin metal tabs and flanges that fix pivots and springs. The suspension itself is of low grade.
Entry level hardtails from reputable brands do as advertised. I have ridden quite severe steep, rocky singletrack and minor bumps on basic hire bikes. Dont attempt any big hits or big air.
If you really need it folding, chose a hard-tail.