Hi Emma, 

Thanks for the reply. 

There are no error messages, just missing files in the list. On the right hand side of the screen, the sidebar appears where I can select 'All' and it lists existing files - but it does not include the latest files.

But, I've been thinking about it a bit more and I think it's just the files that have been added on the day I am working. E.g. yesterday I added files to bills and could not locate them to link to later in the day and the same thing happened today, so perhaps it has started to need an overnight before they can be selected?  I've not noticed this behaviour before. 

[NB: these would not be better added as expenses rather than bills - I might need to retrospectively add a bill that was received one day and paid another, or might add it in the morning and be able to pay it later in the day.]

I've tried both :

a) In the invoice/payment details screen, I click the 'Show existing' link and the 'All' option from the bar on the right. 

b) In the 'Expense Transactions' list I click the 'Attach a file' link at the end of the row, select 'All' from the bar on the right. 

If it turns out I need to wait overnight, I'll have to start to take that into account!