>>>>>>I am sure this should be simple since the entire purpose of iExplorer is to be able copying files from PC to iPad. But I can't get it. When I open iExplorer and navigate to a "folder" on iPad how do I command to copy a file there? I don't see a Paste button. I must be missing something simple. If you use iExplorer and done copying files, please let me know how.
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>>>>>IIRC, the ipad is a closed system. The only way to get files on there is through the apple store.
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>>>>You can copy files from computer to iPad/iPhone with iTunes or iTools. I prefer iTools.
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>>>Are they any prerequisites to iTools? Other software that has to be installed?
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>>No, just put iTools to any folder and use it. It's excellent. I don't use iTunes since years. You can believe it convert a mp3 to ringtone with iTools and other things. iTunes is really terrible thing...
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>Thank you. I have been trying to figure out how to use iExplorer to copy a file from my PC to the iPad but not successfully. The only thing I have not tried yet is by dragging and dropping. By the way, when you are in iTools, how do you copy a file from PC to the iPad/iPhone?

it supports drag & drop and select with file explorer dialog.