TLDR: If you skip uploading source of funds evidence initially, you cannot return to that task. Instead, complete other tasks and use 'Upload Optional Documents' to submit photos or PDFs, which will be included in your Thirdfort check.
Source of Funds evidence
If you have skipped the task to upload your source of funds evidence, this cannot be returned to.
To provide your evidence, please complete any other remaining tasks. You will then have the option to 'Upload Optional Documents.'
Through this, you can provide the same photos or PDFs you would have provided in the original task. Once you upload your document,s these are all automatically included in your completed Thirdfort check.