According to Fluentify Terms and Conditions tutors must not exchange contact details with their students. Sessions should always take place via Fluentify video-conferencing platform and messages or files exchanged via chat.
In case of technical issues, sessions could take place on Zoom (a platform recommended by Fluentify and teachers are advised to download Zoom onto their computers). Zoom does not require an exchange of contact details.
If you have large files you want to share with your students, you can use Google Drive or WeTransfer.