Thank you for using Syncfusion Products and for your update.
Please refer the below link to know how to insert various images into Pdf.
Which also includes Multi-framed Tiff images.
This may help someone else in future.
Thank you for your update.
Essential Pdf directly draws the Tiff file into Pdf.
It did not use any other convertor for converting Tiff to Pdf document.
For the multi-framed tiff file, it inserts each frame separately.
Thank you for your interest in Syncfusion Products.
Could you please create a Direct Trac incident for this issue with the subject “Forum 109382-Creating PDF from multi-page TIFF”.
Also please provide us the Tiff file it will be more helpful for us to investigate in this.
Please let us know if you have any concern.