Hi all!

Hope you are all well.
My wife is in the process of applying for citizenship, we are most of the way through the form. Just had some questions.
1) When it talks about past visas, we have the dates for all (missing a reference number for one (FLR from 2019), it isn't on the PDF save of the visa application itself, and we spent hours searching old documents and emails and simply can't find it), is this a problem? Also with it asking if we had fingerprints taken for some of the visas, again, some we have the biometric date, some we don't. We would have saved all this information more carefully, had we thought we'd ever need it, but until now we've never been asked about that before.
2) With the referee form, does this appear later in the application? We are worried that we might get to a stage where we need it and don't have it yet and can't upload it because I have heard you only get once chance to upload documents (not sure if this is true) and want to get this prepared as much in advance as possible. I have found the forms online but these might be out of date.