When I use text layer, I cannot type to this layer, my text showing like name of layer only. Where could be a problem?
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Are you new to AE? You can rename any layer after it is created. If you do not see text when you enter it in the comp panel then check your character panel and reset it.
To learn how to use the text tool type animating text in the Search Help field at the top right corner of AE and look at the help files and community resources. Text in AE is a little different than it is in Photoshop or Illustrator.