Files whose names include a plus sign are not referenced in TeamsActivityHandler.onMessage attachments

[vojtechcahlik-ext44653]

Versions

botbuilder version: 4.22.2
Node version: 18.14.0

Expected behavior

When a user uploads a file and sends it as part of a message, the TeamsActivityHandler.onMessage method should be called and the file should be correctly referenced in context.activity.attachments.

Describe the bug

When the uploaded file contains a plus symbol (e.g. for a file named "document+comments.pdf"), the TeamsActivityHandler.onMessage method is called without referencing the file in context.activity.attachments. Therefore, the information about a file being included in the message is lost.

Curiously, with the application I'm working on, the file (e.g. "document+comments.pdf") gets uploaded to SharePoint. So it seems that the information about the file is lost somewhere further along the way.

To Reproduce

1. On your computer, create a local file with a plus symbol in its name (e.g. "document+comments.pdf")
2. In a Teams bot chat, write a message (any text) without sending it yet
3. Attach the file to the message (choose upload from local device)
4. Send the message (with the attached file)
5. Information about the uploaded file will be missing from context.activity.attachments in TeamsActivityHandler.onMessage