You are using the wp_insert_attachment() function, which states the following in the Codex:
This function is part of the low-level API used by WordPress for handling attachments. To perform the entire attachment upload and insertion process at once, you will want to use media_handle_upload() instead in most cases.
So to automatically generate the image resizes and an attachment entry in the database, use the media_handle_upload() function instead.
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