There is currently no extension for XMPP to allow offline file transfers.
Presumably this would need to be supported by the recipient's server, and it would need to be implemented as a server-specific plugin.
Alternatively a project that may be of interest to you is Jabber Disk, which allows you to upload a file via XMPP, and then returns a HTTP URL you can send to people (for example as an offline message).
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目前 XMPP 没有允许离线文件传输的扩展。
据推测，这需要接收者服务器的支持，并且需要作为特定于服务器的插件来实现。
或者，您可能感兴趣的项目是 Jabber Disk，它允许您通过 XMPP 上传文件，然后返回可以发送给人们的 HTTP URL（例如作为离线消息） 。
There is currently no extension for XMPP to allow offline file transfers.
Presumably this would need to be supported by the recipient's server, and it would need to be implemented as a server-specific plugin.
Alternatively a project that may be of interest to you is Jabber Disk, which allows you to upload a file via XMPP, and then returns a HTTP URL you can send to people (for example as an offline message).
XMPP 有一个扩展 - XEP-0129：WebDAV 文件传输 - 但它被推迟了！
我正在寻找相同的解决方案。我遇到过它，但没有找到仍然支持它的 XMPP 服务器。
仍在寻找解决方案。
XMPP had an extension for this - XEP-0129: WebDAV File Transfers - but it is deferred!
I am searching for the same solution. I came across it, but did not find a XMPP server still supporting it.
Still searching for a solution.
我们实现的离线文件传输是TextOne移动客户端，但我们必须做一个自定义模块。目前还没有好的规范。
但是，对于您的简单需求，我认为您可以纯粹在客户端实现它（上传到 HTTP 服务器）并使用 XMPP 进行信号发送。
We implemented offline file transfer is TextOne mobile client, but we had to do a custom module. There is no good specification for that yet.
However, for a simple need as you have, I think you could implement it purely client side (uploading to an HTTP server) and use XMPP for signaling.