Bytes, not binary mebibytes, in product copy
Upload limits in TalkMoro use decimal bytes: 1 MB = 1_000_000 bytes. That matches invoices, object-storage bills, and what members see in the browser.
This piece exists because we kept arguing in stand-up. Putting it in an Article means support can link it instead of re-explaining MiB vs MB on every ticket.
The app cap is 5 MB (5_000_000 bytes). If Nginx 413s earlier, that is a proxy client_max_body_size miss.

Small nit: 1 MB = 1_000_000 bytes in our copy too. Thanks for being explicit.