Par Marie Bossan
05-06-2026
One of the most common ways of transmitting computer viruses is through file attachments. Outlook makes it simple to share documents and photos from anywhere. That’s why it is important to have all your documents and photos in one place – so you can quickly find, edit, and share on the go.
All other attachment types will still act as regular attachments. When you attach an image that’s larger than 1MB to an email, you have the option to compress/resize it. For best performance, there is a size limit to attachments in Outlook for iOS and Android. If you need to receive a blocked file, ask the sender to upload the file to OneDrive or SharePoint and send you a link. We recommend using OneDrive and sending the recipient a link to the file if you need to send one of these file types to an email recipient.
Admins Admins should view Help for OneDrive Admins, the OneDrive Tech Community or contact Microsoft 365 for business support. For technical support, go to Contact Microsoft Support, enter your problem and select Get Help. If you have a Mac, you can install the free OneDrive desktop app to upload files and folders to OneDrive automatically. (When you move files from other folders on your computer into a OneDrive folder, you’re removing them from your computer and adding them to OneDrive.) You can copy or move files between folders within OneDrive, or from other folders on your computer.
OneDrive for iOS uploads High Efficiency Image File Format (HEIF) photos in their original format, instead of uploading them as JPG to OneDrive to preserve the image quality of original photos and to save storage space. If you still need help, select Contact Support to be routed to the best support option. After a moment, Finder will switch to show your existing OneDrive files and folders in the right pane, and you can drag the file into the sub-folder of your choice.
With Outlook Mobile, search for attachments, people, events and more in one convenient place and get results quickly. You can attach a recent file or a Dropbox, Box, OneDrive, Google Drive file, a file or photo from your device, or take a new photo. To attach a photo or file to an email, tap the paperclip icon in the bottom right-hand corner of the New mail screen. Select a topic below to learn about sharing files and images with Outlook mobile. HEIF and High Efficiency Video Coding (HEVC) are the default file formats for photos and videos on most Apple devices running iOS 11 or later. You may be able to update a setting on your Apple device camera to capture photos and videos in other formats.
To move a file using Mac Finder, drag files from the file list in the right pane to OneDrive in the left pane (if you have OneDrive listed there under Favorites). To move a file using Windows File Explorer, superonni drag files from the file list in the right pane to OneDrive in the left pane.
To attach a file from your iCloud Drive, tap the paperclip at the bottom of the compose screen, above your keyboard. To learn more about the HEIF and HEVC file format, and which Apple devices can capture media in HEIF or HEVC format, see using HEIF or HEVC media on Apple devices. You can view your HEIF and HEVC files in the OneDrive website in any browser. Contact Support For help with your Microsoft account and subscriptions, visit Account & Billing Help. Learn how to set where your files are saved or move your files to OneDrive. In new installations of Windows 10 or 11 for many eligible users, files save to OneDrive by default in Windows 10, rather than to your PC.
The new camera will adjust images so the background isn’t too bright and the words are easier to read. If you save the draft and come back later, and you add another large image, you will be asked again and your choice will apply to all drafts during that editing session. To obtain a sharing link in OneDrive, highlight the file and choose Get Link in the menu bar. If you need to send a file that’s blocked by Outlook, the simplest way to send your file is to upload it to OneDrive or a secure network share server such as SharePoint.
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