Booklet downloading?

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Hello

I am trying to use 'Digital Booklets' for the first time. Is it normal when you click on the link for a browser to open and download the booklet every time?

I have placed a file called booklet.pdf in the album folder

I have entered the following in tagFormat

Comment.displayFormat={$*infoFileURI^<a href="^">Digital booklet</a>$comment}

I have rescanned

I am using Bubbleupnp on android

I open the album press metadata and click on Digital booklet

Browser opens and downloads file.

As always thanks for any help in advance.