Open your PSD in Full Studio and wait for the local import to finish. Large documents use browser memory; keep the original file untouched.
Inspect every imported layer. Raster layers are supported, while advanced text, smart objects, masks and styles may change, flatten or trigger warnings.
Export a new PSD copy for supported raster layers and reopen it to compare. Also keep a native project backup and export PNG or JPG for sharing; neither guarantees preservation of the original PSD structure.