Either nothing happens or you get an error message: 

 Upload failed. We could not connected to the Internet or an anti-virus/browser-extension is blocking file uploads. If this persists, please note what you were trying to do and contact us.

Reason: Likely an antivirus, such as BitDefender, is blocking uploads to encyro.com. 

(Another possibility is that the file is too large: see why attaching a file fails.)

How To Fix

BitDefender

BitDefender's "Online Threat Prevention" feature can at times incorrectly block uploads. To fix, add www.encyro.com AND files.encyro.com to BitDefender's allowed or safe list.

Instructions from BitDefender: https://www.bitdefender.com/support/bitdefender-is-blocking-a-safe-website-or-online-application-1795.html

Older versions:  https://www.bitdefender.com/support/what-to-do-when-bitdefender-2015-blocks-a-safe-website-or-online-application-1294.html

(Additional information for other versions: https://www.bitdefender.com/consumer/support/answer/1519/)

MalwareBytes

For MalwareBytes, please add www.encyro.com  AND files.encyro.com to exclusions per instructions at https://support.malwarebytes.com/docs/DOC-1058.

In short, when you get a warning the the one below, click "Manage Exclusions"

Then, click "Add Exclusion" on the MalwareBytes window that opens.

On the next screen select "Exclude a Website" and click "Next."

Under "Exclude a URL", enter www.encyro.com

Prevent future false detections

Also, report the false positive (that is, an erroneous detection by MalwareBytes) at: https://support.malwarebytes.com/docs/DOC-1413.

AVG

For AVG, please see these instructions to set exceptions for Web Shield or Website Shield.

ESET

For ESET, please see these instructions, and add *.encyro.com to the safe or allowed URLs. If the * is not allowed, please add www.encyro.com AND files.encyro.com.  

ESET also has several other components such as HIPS that may block file transfers. If adding *.encyro.com to the list of allowed websites does not resolve the issue, you may have to look into the HIPS settings, firewall rules, or additional items.

Others

For help finding the relevant instructions for other antivirus or browser extensions, please contact us.