To troubleshoot a failed large file upload in Salesforce, start by checking whether the file exceeds Salesforce’s native size limits, then look at your network connection, browser settings, and any active timeout restrictions. Most upload failures come down to one of three things: the file is too big for the native limit, the connection dropped mid-upload, or the org’s storage settings are blocking it. The sections below walk through each cause and how to fix it.
Salesforce enforces a maximum file size of 2 GB for files uploaded through Salesforce Files (the standard Files object). However, this upper limit only applies under specific conditions. Files uploaded via the API have a cap of 2 GB as well, but files attached through older Attachments functionality are limited to 25 MB. Chatter posts cap file attachments at 2 GB, but practical performance tends to degrade well before you reach that ceiling.
Here is a quick reference for the most common upload limits you will encounter:
The 2 GB ceiling sounds generous, but it is the org’s total storage cap that causes the most surprises. If your organization is close to its storage quota, even a small file upload can fail without a clear error message.
Large file uploads fail in Salesforce for several reasons, and the root cause is not always obvious from the error message alone. The most common culprits are file size exceeding the relevant limit, insufficient org storage, browser or network timeouts, and permission restrictions on the record or object you are uploading to.
Beyond those basics, a few less obvious causes are worth checking:
If the upload fails silently or returns a vague error, check the browser’s developer console for a more specific HTTP response code. A 413 error means the file is too large. A 504 means the request timed out. A 403 points to a permissions issue.
When a Salesforce file upload keeps timing out, the fix usually involves either breaking the file into smaller parts, switching to the Salesforce API for chunked uploads, or adjusting your org’s session timeout settings. For most users, the fastest resolution is to use a supported upload method that handles large files more reliably than the standard drag-and-drop interface.
Here are the steps to work through, in order:
Salesforce Files and Attachments are two separate storage mechanisms with very different size limits and capabilities. Salesforce Files supports files up to 2 GB, can be shared across multiple records, and integrates with Salesforce’s content library. Attachments are a legacy feature capped at 25 MB per file and are tied to a single record with no sharing or version control.
For large documents, Salesforce Files is the right choice every time. Attachments were designed for a much earlier era of Salesforce and have not kept pace with modern document management needs. If your team is still using Attachments for contracts, project files, or media assets, migrating to Salesforce Files will immediately raise your effective upload limit and give you access to content versioning, sharing permissions, and better search. Salesforce itself recommends moving away from Attachments in favor of Files for all new implementations.
One practical note: even with Salesforce Files, files over 2 GB are not supported natively. For video files, large design assets, or bulk data exports, you will need an external storage integration.
You should use an external storage integration when your files regularly exceed 2 GB, when your org is consistently approaching its storage quota, or when your team needs to collaborate on files in real time without downloading and re-uploading them. Native Salesforce storage is not designed to be a primary file repository for document-heavy operations.
Common scenarios where external storage makes more sense than native uploads include:
Integrating external storage with Salesforce through a document management layer keeps files accessible from within Salesforce records while offloading the storage burden. This approach also removes the per-file size ceiling as a limiting factor, since the external system handles storage independently.
Document management tools prevent upload failures in Salesforce by handling file size validation before upload, routing large files through more reliable transfer methods, and integrating directly with external storage so files never hit Salesforce’s native size or storage limits. Rather than relying on the browser-based upload interface, a purpose-built tool manages the process in the background with error handling built in.
Good document management tools also add a layer of organization that prevents the conditions that lead to failures in the first place. Duplicate files, oversized folders, and disorganized storage all contribute to hitting storage limits faster. A structured document value model keeps storage lean and reduces the frequency of upload-blocking quota issues.
We built Cartularius specifically to remove the friction that comes with managing documents inside Salesforce, and upload failures are a big part of that friction. Here is what we do differently:
If your team is regularly running into upload failures, storage limits, or file chaos inside Salesforce, take a look at our pricing options and see how we can help you get this under control.
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