Creates a signed upload URL. Signed upload URLs can be used to upload files to the bucket without further authentication. They are valid for 2 hours.
buckets
table permissions: noneobjects
table permissions: insert
The file path, including the current file name. For example `folder/image.png`.
const \{ data, error \} = await supabase
.storage
.from('avatars')
.createSignedUploadUrl('folder/cat.jpg')