Add steps for securely sharing files with NextCloud

tools/securely-sending-files-nextcloud.md

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+# Securely Transferring Files Via NextCloud
+
+## Internally/Users with MayFirst
+
+Clients with MayFirst hosting can be shared with directly in NextCloud, using their MayFirst login. [Unable to confirm this works - definitely works within Agaric members]
+
+### Steps
+
+1. Ensure the file you want to share is stored on NextCloud.
+2. View the details of the file (from web UI select "..." drop down for file and select details).
+3. On the sharing tab, look up the user's email address or MayFirst user name and select them.
+4. From the drop down "..." next to the user, you can specify access level and expiration, etc.
+
+# Externally
+
+Use this method when a file needs to be shared with an individual outside the organization. 
+
+This represents a suggested flow for securely sending a file, using email to communicate. A shared link is instead used to make the transfer, with steps to be followed to ensure unencrypted email snooping is highly unlikely to be an issue.
+
+[Review existing shared files/links](https://share.mayfirst.org/apps/files/?dir=/&view=shareoverview)
+
+## Steps
+
+1. Ensure the file you want to share is stored on NextCloud.
+2. View the details of the file (from web UI select "..." drop down for file and select details).
+3. On the sharing tab, click share link.
+4. Click the "..." drop down for the link, and add a password. A default will fill in for you - improve it, if warranted.
+5. Optionally, you might also reduce the default expiration to just a day or so.
+6. Copy the password for the link, and head to https://onetimesecret.com/ and create a secret there containing that password. Optionally, add a password for the secret retrieval (again: as warranted).
+7. Send the one-time secret link to the recipient via email (along with the password for retrieiving it). _Do not yet send the shared URL._ Ask for a response confirming the password has been acquired. For example: >We will share a link to the file with you via a safe transfer service. In order to download the file, you will need a password. The password can be retrieved from {onetimepassword link}. Use the password {password} to see this secret. Once you have copied the password to your computer, let us know, and we can share the link to the file.
+9. Once the recipient confirms receiving the password (meaning no one else can then access it via the onetimesecret link), send the share link to the file.