E-Transmit Model button not show up

[gzhang25ARK2D]

|I tried to e transmit file,  but transmit model Button doesn't show up

[barthbradley]

Close the Project that you are Transmitting. 

...do you get the "eTransmit requires all Revit Projects to be closed" message?  

Help | eTransmit for Revit | Autodesk

[gzhang25ARK2D]

Yes., I did. But still not show up.

[barthbradley]

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@gzhang25ARK2D wrote:
Yes., I did. But still not show up.

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Are you saying there is no eTransmit under Add-Ins?  

[gzhang25ARK2D]

It's not showing Transmit model Button.

[ToanDN]

If the Transmit a model button is not on the Add-ins ribbon then it has not been installed.  What is your Revit version?

[barthbradley]

eTransmit for Revit | Revit 2019 | Autodesk Knowledge Network

...same info as in link above, only prettier packaging. 😉

[barthbradley]

PLAN B: 

About Revit Viewer | Revit 2021 | Autodesk Knowledge Network

[gzhang25ARK2D]

It's Revit 2021. 1. 2

[barthbradley]

LT or Full?  

If eTransmit is supposed to be included with your version (I'm not sure about LT), then maybe a reinstall is in order.  Maybe there was a prompt you blew by initially.   

...shot in the dark: check your User Interface tab under Options and see if it's part of the tools not checked.  

[gzhang25ARK2D]

If I reinstall, would possible I lose my existing file? How to do the
reinstall?

Thank you.

[barthbradley]

Nope. You won't lose it. 

Before reinstalling, try Repair.  You do this through the Control Panel's Program and Features=>Uninstall Program.  Select the Revit Version and press uninstall. You will then be given the option to Repair. 

[ToanDN]

Are you using Revit LT 2021?  Do you even have Add-Ins tab?