o_attachment_preview is not found

[vancouver29]

Hello everyone,

i am trying to implement this addon Attachment_Preview in odoo v13, but it does not work. The method getPreviewableAttachments returns an empty array on which the done method is called. I figured out that the items variable in the function getPreviewableAttachments is empty because the class .o_attachment_preview is not found.

Does anyone know wether this class .o_attachment_preview in odoo v13 is changed ? Or does anyone have a hint for me to make this addon to work in odoo v13?

Thank you in advance