For TWRP versions lower than 2.8.2.0, the file will be copied to your device to whatever the current storage location is that you have selected in the mount page. It will always be placed in the root of that storage location and named sideload.zip (e.g. /sdcard/sideload.zip) and it will automatically delete / overwrite any existing sideload.zip you may have on your device. As soon as the file is copied to your device, it will automatically be installed. When the install is finished you will be presented with a reboot system button so that you can reboot to test your zip.
TWRP versions 2.8.2.0 and higher will stream the zip from your PC without storing it on your device. If you wish to store the zip on your device for later, you should not use sideload and instead use adb push or some other method to copy the zip to the device.
sideload?
/data吧，好像，忘了，TWRP下面用sideload的时候有message的
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