pdfcpu version: v0.4.1 dev
os: macOS Monterey 12.6.2

I added an attached video named 操作.mp4 inside the pdf with the following code:

err := api.AddAttachmentsFile("./content.pdf", "",[]string{"./操作.mp4"}, false, nil)
if err != nil {
    t.Fatal(err)
}

add attachtment file is ok. But read the content.pdf file, receive an error about: pdfcpu: invalid UTF-16BE detected:

pdfCtx, err := api.ReadContextFile("./content.pdf")
if err != nil {
    t.Fatal(err)
}
t.Log(pdfCtx.Creator)

The same video, after modifying the name, can be read.