When exporting a statement the filename has 3 different naming conventions of which none are any convenient when managing an administration with multiple bank acounts.

For example (examples with csv extention but also goes for PDF)
Via the auto export function the filename is :
[IBAN].csv

Via the Bunq app the file name is:
yyyy-mm-dd_hh-mm-ss_bunq_transactieoverzicht.csv

Via the Web the file name is:
yyyy-mm-dd yyyy-mm-dd - Export Statement.csv (with first date start of period and second end of period selected)

My suggestion:
Use 1 format in all these exports
[period startdate] [period enddate] - [IBAN] - [AccountNickname].csv

example output:
2025-03-01 2025-03-31 - NL13TEST0123456789 - Main.csv

This is consistent and way easier to manage if you need to manage an administration with multiple bank accounts.

Even more fancy would be a configurable file format which is user specific.