You could reduce the resolution in Pix4D (https://support.pix4d.com/hc/en-us/articles/202559989-How-to-reduce-the-Size-of-the-Orthomosaic) or use some 3rd party software (like QGIS) to reduce the resolution. The link might be useful:How to manage really large GeoTiFF files?? - #5 by Andrew_Weatherstone
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