I applied for a grant but only a Letter of Intent was sent. Do I have to upgrade to have full grants written?

No. This is one of the perks of adding Grant to your team. Grant will generate the related LOI or Q&A details based on the first step of the grant you're applying to. As that application progresses throughout the submission process, you have the ability to add additional steps that Grant will continue to support throughout the entirety of that opportunity. In this case, whether an LOI or Q&A format is the first step of the application process, Grant will only use 1 credit to support that opportunity end-to-end.