Hi there Chenchen,

Thanks for reaching out about your multicurrency setup. QuickBooks Online is a great tool able to help you create and send invoices so your clients know about the services offered by your company. I can provide some information about adding currencies.

One possible cause for information being blank in a drop-down menu would be browsing data. These temporary files can accumulate and cause errors like missing information in any cloud-based software like QuickBooks Online. You can use these steps to resolve issues caused by browsing data:

• Clear your browser cache if you're using a browser
• Try a browser if you're using the app
• Try deleting the app from your device, and installing it once more from the app store
• Try a private browser window
• Try another browser type
• Make sure you're using a supported browser and system
• Reset your Internet or try on another computer or device

If you have any other questions or need further assistance, feel free to reach out here.