Upload files. Is it stored in the entire ipfs network or only in the upload node?

I am new to ipfs, my English is not good, this is Google Translate.
Upload files to ipfs, are all the files stored on the current node or on the entire ipfs network?
Scenario description:
I have 3 ipfs nodes, after I successfully uploaded a file on node A. Then I shut down the A node, and then I went to the B node to get the file just uploaded, but it was unsuccessful. Finally, I started the A node, and then went to the B node to get the file, and it was successful.

Iā€™m sorry that my English is not very good, can you understand my English?

Files are stored on the current node. They are stored on other nodes when they are requested only, not automatically.

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wish you a happy life :grinning:

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