Share files securely
Email and cloud storage are convenient, but the contents end up in systems you do not control. Encrypting the file first makes that far less serious: in transit nobody sees more than an unreadable file.
The order that works
Encrypt first, then send. Protect the file locally with Loclavis and attach the result. Your mail provider, the recipient's mail server and any cloud storage in between then see nothing but encrypted bytes.
Send the password another way
This is the step that most often goes wrong. A password in the same email as the file protects nothing at all. Use a second channel: a phone call, a text message, a messenger or a conversation in person. A word passphrase is particularly easy to pass on this way.
Which variant is easier for the recipient
If you send an ordinary PDF, Loclavis produces a password protected PDF. The recipient needs nothing but their PDF reader. For every other file type you get a protected file, which the recipient opens for free through Loclavis. It helps to tell them briefly how.
What encryption does not hide
The attachment's filename, its size and the timestamp stay visible along the way, as do sender and recipient. The contents and the original name inside the container are protected. If the filename itself would give things away, rename the attachment to something neutral.
After the handover
Delete the unencrypted copy from places it should not stay, such as your downloads folder or your mail client's trash. And treat the password like a key: whoever had it once still has it. For a new handover, a new password is worth the effort.