You can add this custom field to any Joomla components that support the Joomla custom fields system and this will display a button for multiple file upload with the only size limit of the "Max. file size (MB)" param, or none if set to 0.
If you set "Multiple file upload" as "no", you will have a field for store the uploaded file name, and you can define another field as the destination target for de uploaded file.
In either cases the upload will be made with the plupload js library and plupload php upload handler for allow uploading of files with sizes many times bigger than the php upload limit permit. Even you can upload files of many GigaBytes in size.
You can also include this custom field in your component or any other extension.
The only need is to install the plugin, enable it, and add this to your extension
in the extension ".php" file before any call to render or show any form.
if(isdir(JPATHPLUGINS . '/fields/plupload')) {
Form::addFieldPath(JPATH_PLUGINS . '/fields/plupload/fields');
}