docs: document default 60s request timeout for file upload

docs/filesystem/upload.mdx

@@ -7,9 +7,11 @@
 
 ## Upload single file
 
+Read the file from your local filesystem and pass its contents to `files.write()`.
+
 <CodeGroup>
 ```js JavaScript & TypeScript
 import fs from 'fs'
 import { Sandbox } from 'e2b'
 
 const sandbox = await Sandbox.create()
@@ -31,6 +33,19 @@
 ```
 </CodeGroup>
 
+The upload has a default request timeout of 60 seconds. If you're uploading large files that take longer to transfer, override it by passing `requestTimeoutMs` (JavaScript & TypeScript) or `request_timeout` (Python).
+
+<CodeGroup>
+```js JavaScript & TypeScript
+// Override the default 60 second request timeout with 120 seconds
+await sandbox.files.write('/path/in/sandbox', content, { requestTimeoutMs: 120_000 })
+```
+```python Python
+# Override the default 60 second request timeout with 120 seconds
+sandbox.files.write("/path/in/sandbox", file, request_timeout=120)
+```
+</CodeGroup>
+
 ## Upload with pre-signed URL
 
 Sometimes, you may want to let users from unauthorized environments, like a browser, upload files to the sandbox.
@@ -88,7 +103,7 @@
 const sandbox = await Sandbox.create()
 
 // Read all files in the directory and store their paths and contents in an array
 const readDirectoryFiles = (directoryPath) => {
   // Read all files in the local directory
   const files = fs.readdirSync(directoryPath);
 
@@ -109,7 +124,7 @@
       };
     });
 
   return filesArray;
 };
 
 // Usage example