the page for it's specs says this
"Hard Drives:
1TB 5400RPM SATA HDD
1TB 7200RPM SATA HDD
1TB 5400RPM SSH-8GB
Solid State Drives:
128GB/256GB/512GB SATA3 M.2 SSD"
https

/www.asus.com/us/Laptops/FX503/specifications/
so, it supports M.2 SSD SATA3 so no, it won't work