With regards to FSMone's RSP foreign currencies ETF, would FSMone auto convert SGD to the respective currencies for the RSP or do I have to manually convert money to the respective currencies?

You can do a CAT top up with the relevant currency for the RSP but for myself I will manually do the conversion on FSMOne.

I encountered this recently in my purchase of US based ETF via FSMone.

The SGD was in my Auto-sweep whereby the conversion was auto.

However, when I sold off the ETF, the USD will be put back into Cash Holdings as USD. There is no auto-conversion on sale.

Hope this helps!