mysql - PHP get the strings separate to store in the array

I am working on my PHP to fetch the data from the mysql database. I have got a problem with storing the filename in the array using the values when I have stored both filenames in a database.

Here is what I have stored in the blob:

draft_attachment.rar
draft_attachment - Copy.rar
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Here is the code:

$mailbox = $link->prepare("SELECT * FROM draft WHERE id = ?");
$mailbox->execute([$id]);

// set the resulting array to associative
$row = $mailbox->fetch(PDO::FETCH_ASSOC);
$attachments = array();

if($mailbox->rowCount() == 1)
{
    $attachment = array();
    $draft_to = htmlspecialchars($row['to_email']);
    $draft_subject = quoted_printable_decode($row['subject']);
    $draft_message = $row['message'];
    $attach[] = $row['attachments'];
}
?>
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When I try this:

$attach[] = $row['attachments'];
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It will store both strings in the array:

Array
{
   [0] => draft_attachment.rar
draft_attachment - Copy.rar
}
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So I have tried this:

$attachments = array();  
$i = 0;

if($mailbox->rowCount() == 1) {
    $attachments[$i] = $row['attachments'];
    $i++;
}
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It wont store the strings separate so I dont know what to do.

Here is what I want to achieve:

Array
{
   [0] => draft_attachment.rar
   [1] => draft_attachment - Copy.rar
}
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Can you please show me an example how I could get both strings to go separate so I could be able to store them in the array using the value?

Thank you.