Xojo2024R2.1: WebFileUploader - problem opening file selection dialog

I can’t replicate this yet and I have not enough info to share but it has been reported to me that WebFileUploader control used in our Web App is not opening File selection dialog. I hope to get more info but in the meantime perhaps someone has already noticed or heard about any issues with this control?

More info: the problem was spotted when using Docker, no problem in “regular” setup.

Docker as the server or as the client?