Thank you! It’s more clear now.
Should I select yes this part and enclose my national passport in folder?
will they seize it again if send it them?
Do you have any valid travel document or passport from any country other than Canada?
O Yes, enclose the document (original only). If no longer in yourpossession, explain why.
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there are a few things here:
1. technically you can only have a passport or a RTD in your possession as a valid travel document, that's why during your RTD application they are asking for the original travel document
2. will they seize it again? yes, they will, until you decide to give up on using RTD and to request the passport back
3. should you use your passport to travel? well first of all, probly should not to your home country which i assume you have already known, but to other countries, yes it's completely up to you to decide. IRCC and CBSA are two different entities, when IRCC says it's up to you it doesn't mean CBSA is indifferent too. i know some people using their home country passports to travel to some 3rd countries and back without issue, but it's entirely up to the CBSA agent and their mood on that particular day when they see you. in theory they can say "oh you are using your home country passport, so that must mean you give up the protection, fine let me forfeit your pr card", or they can simply wave you pass.
4. what to do next? i'd say just give CBSA a call, let's say you are driving to the us, google the CBSA border station phone number at that crossing, call them, explain the situation nicely and they will let you know, if they say, that's fine, maybe it's fine, but if they say, no you should always use RTD, then better safe than sorry.