Account limited - explain your activity

[frost6k]

I received this account limitation and it said:

We need some information from you

We need some information from you to help understand your business better.

Until we've received your information, some features in your account will be limited. You'll be able to regain access to these features once you've provided the information we've requested.

If you're unable to submit the required information by 4 Jun 2021 or if we notice additional changes in your account activity, your access will be further limited.

What caused your recent increase in sales? (events, unique sales, seasonal peaks, etc.):

which I can explain.

but below it said:

If you have any additional supportive documents upload them below.

Exactly what documentation am I meant to provide?