Do i have to sign apk to upload to google play store when build the game using Gdevelop build service?

when build the game by using Gdevelop build service, Can i upload the apk file to google play store directly or do i need to sign apk or is it already sign by Gdevelop?

I don’t think it is. The purpose of signing is proving that you, the developer, created this apk so that others cannot just make a fake update with a virus, as they cannot sign as you. If GDevelop could sign for you, then other people than yourself would be able to sign APKs and it would defeat the purpose of signing.

so what should i do with the apk file (built by Gdevelop build service). can i just upload it to play store and will it be fine??