[FEATURE] Allow file uploads in embedded chat interface

[mhjb]

Describe the feature you'd like
In ChatGPT & the OpenAI Assistants Playground, I can upload attachments (where the model supports that)
I'd love it if I could do the same with Flowise's embedded chat widget?

Additional context
ChatGPT:

[ksingh-scogo]

Agree, much needed feature. I am working on a chatbot solution where i need to accept images from the user and send these images with users text response over email. Capability of uploading images in Flowise chatUI is much needed.

[ingrivia]

any update on this?

[blissiraDC]

Also agreed, this is badly needed, and sorely missed. Also option for Text to speech input. Only having it available in share chatbot is missing a trick, thanks @HenryHengZJ for all your incredible work, this platform is by far the best already. Just a couple of tweaks here and there and its the ultimate monster! BUT you are still the AI god! I appreciate you!

[HenryHengZJ]

Closing as #3059 merged!