Hi, @adson gomes. Apologies for writing in English - I don’t speak Portuguese.
Are you trying to export frames from a Figma Design file? Make sure that you have set up Export options for the layer you want to export. To do that, do the following:
Select the layer on the canvas or on the layers panel to the left.
Click the + button in the Export section of the Design panel to the right.
Adjust the Settings of the export to whatever your preferred export format is.
Click the export button below the settings. It will say something like “Export Frame 9”, where “Frame 9” is the layer name.