Attachments (bijlagen)

I am new to Thunderbird.
Cannot find the attachments in my e-mails, sometimes below text but not seperately.
Thanks for answering (also in dutch; is a dutch site also available?)

The attachments can be viewed from Message/Attachments on the Menu Bar (press Alt if the bar is hidden), or if the Attachment Pane is enabled (right-click at the bottom of an open message). But some mail apps, such as those on iPhones, encode the attachments so they are not visible to the recipient. Is that a factor?