文件管理器与窗口权限不一致导致上传文件失败。

用普通权限登录后，更换用户后权限不会同步，导致更换用户后上传文件失败。

After logging in with regular permissions, the permissions will not synchronize after changing the user, resulting in file upload failure after changing the user.

Start by reproducing the permission mismatch in the file manager and window after logging in with regular permissions, switching users, and attempting a file upload. Trace where the active user or permission state is handled during the user switch and upload flow. Done means uploads succeed with the expected permissions after changing users.

Written by the indexing model from the issue text.