addCustomRemoteHeaders or addCustomHeaders

[sitesurfer]

Hi all, trying to upload SVG files and have come across the S3 issue with the mime type.

Did some digging and can see that there are two methods as above which should be ok, however - when i try to use these methods on a livewire upload - I get a message as follows:

Call to undefined method Spatie\MediaLibraryPro\PendingMediaLibraryRequestHandler::addCustomRemoteHeaders()

This being my snippet:

$formSubmission->addFromMediaLibraryRequest($this->upload_media)
->addCustomRemoteHeaders($svgHeader)
->usingFileName( function(MediaLibraryRequestItem $item) {
return Str::random(40).".".pathinfo($item->name,PATHINFO_EXTENSION); })
->usingName("Image for ".(ucwords($this->accountSlug)))
->toMediaCollection('le_media_item');

Can anyone point me where I am getting this wrong please?