See this guide by Adobe that demonstrates what these options do and where to find them: https://helpx.adobe.com/uk/acrobat/using/sharing-pdfs.html
The sharing tools are normally located in the top-corner of the tool bar. See image below:
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If these options are missing. You can try the following:
Method 1) – Check Adobe Version and perform updates in Adobe.
You can check the Adobe version by going to the ‘Help option’ on the top left and selecting ‘About Adobe’.
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You can compare your version through Adobe’s release notes:
Acrobat & Acrobat Reader Release Notes: https://helpx.adobe.com/uk/acrobat/release-note/release-notes-acrobat-reader.html
If needed, check for updates.
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Method 2) – Perform Adobe Repair:
Within Adobe, go to the ‘Help’ option on the top left and select ‘Repair Installation’.#
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Method 3) – Uninstall Adobe and Creative Cloud and reinstall.
Go to the Start Menu, type in ‘Control Panel’ and open it:
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Select ‘Uninstall program’
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Select Adobe and hit ‘Uninstall’.
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Creative cloud can prove difficult to uninstall. You can download and run the Creative Cloud Uninstaller to uninstall it. See link below:
After uninstalling, restart the device and reinstall Adobe.
Method 4) – Uninstall Adobe Acrobat using AcroCleaner and reinstall.
Adobe provides a cleaner tool to remove installations of Reader and Acrobat. See link below:
https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html
If your organisation has purchased an Acrobat license, then I would advise installing Adobe Acrobat Enterprise: https://helpx.adobe.com/uk/acrobat/kb/acrobat-dc-downloads.html
Method 5) – Contact Adobe Support
You can reach Adobe via phone:
https://helpx.adobe.com/contact/phone.html