How can I work/open a .tsx file with Passolo?

I have a website project and the file format they have provided me is a .tsx, however, Passolo does not open the file. How can I work with this type of files in Passolo? Would very much much appreciate indications with screeshots, if possible. I have found some info about this in another post but cant figure out the indications and the links they provide do not work. Sorry and thank you in advance.

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