Why are large files not uploading?

Question

linux

Apache server, Odroid XU-4 mini PC, Ubuntu OS. Upload files larger than 8 mb. from the local network do not cause problems. But if you try to upload a file larger than 2 MB from an external network. then the file upload error is guaranteed. What could it be?
php.ini >>>
file_uploads = On
display_errors = On
upload_max_filesize = 80000000
max_file_uploads = 22
post_max_size = 80000000
upload_tmp_dir = download_tmp
memory_limit = 80000000
upload.php >>>
<?php
echo("Start
");
for($i=0;$i";
exit;
}
}
$uploaddir = './download/';
$uploadfile = $uploaddir.basename($_FILES['
if($_FILES["filename"]["size"][$i] > 1024*50*1024)
{
echo ("The file size exceeds 50 Mb");
exit;
}
echo("Test this file
");
// Check if the file is uploaded
if(is_uploaded_file($_FILES["filename"]["tmp_name"][$i]))
{
echo("Download
");
// If the file was uploaded successfully, move it
// from the temporary directory to the target directory
move_uploaded_file($_FILES["filename"]["tmp_name"][$i], $uploadfile);
echo("move
");
sleep(3);
echo "";
} else {
echo("Error download file");
}
}
?>

Answer 1

post_max_size
max_file_uploads
upload_max_filesize

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If it doesn't work, then
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studio

Answer 2

post_max_size ?

Answer 3

Most likely the problem is in the network, ie. the download of the file has a time limit for downloading, and during this time it does not have time to download. Accordingly editing Php.ini