Investigate issue with remote attachments on dev.xmtp.chat

[daria-github]

Describe the bug
There have been reports of issues loading in remote attachments in the dev environment. After sending an attachment, await RemoteAttachmentCodec.load(attachment, client) throws an error Error: invalid ciphertext salt length: undefined despite the attachment object clearly including a valid salt. There is no error on send and only on receive.

The sending app is a web app on v9 of the JS SDK.

The attachments load properly in xmtp.chat, and this issue is only occurring in dev.xmtp.chat.

This ticket is to try to reproduce the issue and determine next steps.