Not specifically for uploading, but you can probably combine a few things. I did a custom UI with the help of Devmik for the V1 webchat here https://discord.com/channels/1108396290624213082/1212341078565589023 . There is a React library for the V2 webchat https://botpress.com/docs/developers/webchat-v2/react/ and then you can read a bout file uploading here https://discord.com/channels/1108396290624213082/1189632494241321180 . If you want to let them upload images then either make a base64 string out of them or upload them to a bucket in AWS.