When I double click on the "Filename" field to export (regardless of the format of export) nothing happens.  So, of course, when I click on "Export" it says "You have to enter a filename (Close)".
 

Inkscape 1.3.1 (9b9bdc1480, 2023-11-25, custom)

    GLib version:     2.72.4
    GTK version:      3.24.33
    glibmm version:   2.66.2
    gtkmm version:    3.24.5
    libxml2 version:  2.9.13
    libxslt version:  1.1.34
    Cairo version:    1.16.0
    Pango version:    1.50.6
    HarfBuzz version: 2.7.4

    OS version:       Ubuntu Core 22

How to export PDF with Layers?

James Bowery: The filename field is for text entry. Single click then type your filename. Or try single click on the adjacent folder icon.

miquel: All visible Inkscape layers are exported to a flat pdf with no layers.

PS. You're more likely to get a reply if you create a new topic rather than asking unrelated questions in an existing topic.

I need two separate layers in one PDF file, for example, one layer is the design and the other is the lines for cutting.

Single click and type was the FIRST thing I tried before I searched the web and found a video that said to double click.  

Neither works.  There is no way to enter a file name.

James Bowery: Sorry, I can't reproduce the problem.

For the sake of clarity, let me check that we're talking about the same thing. In this screenshot I opened the Export dialog with [File > Export...] or [ctrl+shift+e]. I highlighted the filename field and the folder picker icon. Are you doing the same?

miquel: As I said, Inkscape can't export pdf layers. It can export layers to separate pdf files, if that helps you. Open the Export dialog [ctrl+shift+e] then [Batch Export] [Layers].

Thank you very much, but I will still have to wait for a new version of Inkscape that will support CMYK and spot colors because I work almost exclusively on packaging for medicines and food. Unfortunately, there is a lot missing compared to Adobe. Support for cmyk and pantone would contribute a lot to linux in general, they would have a huge base of graphic designers as users

Yes that is the dialogue that doesn't work on my system.  The "Filename" field will not permit me to enter anything.

I am having exact same problem.

"Filename" field does nothing

on Ubuntu 20.04.6 LTS.

Inkscape 1.3.1 (9b9bdc1480, 2023-11-25, custom)