What should I do if I need to upload multiple documents for my DTV application but the portal only allows one file per section?

Hi everyone - hoping to get some advice from anyone who’s been through the DTV application recently 🙏

I’ve submitted my application via the London embassy and have been asked for additional supporting documents. One issue I’m running into is that the visa portal only seems to allow a single file upload per section.

For example, I need to submit multiple invoices and supporting income documents, but I can only upload one file at a time. I’m also wondering how others have managed this?

Also slightly related - I’ve been told to remain in the UK while my application is being processed, but I already have travel booked for early May. I’d really appreciate hearing how others have handled timing/travel during the application process as well.

Any experiences or advice would be massively appreciated - thanks in advance!