transfer downloaded titles between devices?

[Zylan-cell]

功能描述 / Feature description

the ability to transfer downloaded titles to other devices. for example, how that implemented in hentoid.

备注 / Additional details

No response

自查步骤 / Self-review steps

• 如果您有足够的时间和能力，并愿意为此功能请求提交 PR ，请勾上此复选框 / Pull request is welcome. Check this if you want to start a pull request
• 您已搜索过 Issue Tracker，没有找到类似的请求 / I have searched on Issue Tracker, No duplicate or related open issue has been found
• 您确保这个 Issue 只发起一个功能请求。如果您有多个功能请求，烦请发起多个 Issue / Ensure there is only one feature request in this issue. Please make mutiply issue for mutiply feature request