Update Documentation

Author: MarkBaker

docs/topics/recipes.md

@@ -1483,6 +1483,22 @@ $drawing->setHeight(36);
 $drawing->setWorksheet($spreadsheet->getActiveSheet());
 ```
 
+Note that GD images are memory-intensive.
+
+### Creating a Drawing from string or stream data
+
+If you want to create a drawing from a string containing the binary image data, or from an external datasource such as an S3 bucket, then you can create a new MemoryDrawing from these sources using the `fromString()` or `fromStream()` static methods.
+
+```php
+$drawing = MemoryDrawing::fromString($imageString);
+```
+
+```php
+$drawing = MemoryDrawing::fromStream($imageStreamFromS3Bucket);
+```
+
+Note that this is a memory-intensive process, like all gd images; and also creates a temporary file.
+
 ## Reading Images from a worksheet
 
 A commonly asked question is how to retrieve the images from a workbook