I cannot select text in a PDF in Zotero editor

I want to annotate a PDF inside the Zotero editor in order then to create the note with the annotations. This feature is convenient since I can import these notes into other note-taking apps like Notion and Obsidian. When opened the PDF with Zotero I cannot select any text in order to highlight it. However, when I open the PDF with an external editor I can select the text and highlight it, something that makes me think that the PDF is not in the correct format for the Zotero editor.
Since I could not find any solution for this, I tried to bypass it with the "Import Annotations" feature, but it also doesn't work as I wanted. When it converts the external highlights into Zotero highlights, they cannot be seen when the note is created based on the annotations.

How can I solve this issue?
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